2 stroke no compression Was out riding on a trail shut off the bike and it wouldnt restart. Jan 15, 2022 · 2 You have no compression – You feel the effects of no compression as your thumb will feel mild or no effects of vacuum and propulsion as the engine is cranked over. I would start looking at ignition timing or I've done this before, left a rag in the intake and mounted carbs, started it and had the same problem, no revs but did idle just fine. To do this, you will need a compression gauge. Low compression in two cylinders can manifest itself in several ways, making it difficult to diagnose without the right tools. Has spark, cleaned exhaust, cleaned carb, new plug, new exhaust baffle plate and cover (old one was cracked and afraid of throwing shrapnel). A 500cc 2 stroke should have at least 140 PSI of compression and 170 PSI for good performance. Should all other plugs be left in except adjacent plug and how much air pressure should I use? The effect of higher compression ratio on fuel consumption and power output was investigated for an air-cooled two-stroke motorcycle engine. Two-strokes have low static compression by design. ct Mar 5, 2021 · I took off cylinder head and when I put it back on my bike has no compression anyone know why it’s really annoying I am supposed to be going riding tmr haven’t been on my bike in about 4 weeks it’s been started and rode but haven’t went real riding on the trails just my street Oct 2, 2006 · NO COMPRESSION The top end had been rebuilt 120 miles ago, Piston and Components rebored the cylinder and i fitted a new oversize piston, rings, gudgion pin and the circlip type things that hold it in and also a new small end bearing. I've cleaned out the carb and played around with the idle screw Oct 7, 2022 · I have a cr 125 that was just rebuilt with new jug, piston and ring. If you are concerned with the seal, you need to check "primary compression" with a vacuum gauge and test with a pressure gauge. i took it apart that night and now its still sitting in my garage in pieces. 4 has the Multiair unit. I’ve been reading that’s no good for a yz250. Turns out that the compression in my engine is terrible. I assume piston needs to be at TDC for the test. How a 2-stroke motor works. Clean, remove, or replace and see if this helps. I figured my ring was bad so I measured my bore size, it was still stock so I put an oem piston ring in it. Common causes of low compression Worn or damaged piston rings. Seems low to me! Still, I only have 100 mL rotary valve engines to go by. Put a new wiseco top end with old new cyclinder (replated and honed ) it’s showing 60 psi on 2 different compression testers the piston is in the right way the rings are gapped at . There were no deep scratches on the inside of my cylinder. Ive been suggested to try replacing the crank seals as that may be what caused the bike to go down initially, but there are no oil leaks. and i decide to check up my compression and i get 70 psi on the two cylinder . You may have a leaky center seal, or a leaky seal on either end of the crankshaft. 2002 Banshee Ported cylinders, ported reed cages w/Boyeson dual-stage reeds, Wiseco stock bore, Flotek . The service manual suggests it should be between 113-138psi. Jul 29, 2023 · I bought a broken 2007 YZ 85 and ended up replacing the carb and a couple other things, but the main issue I’m having right now is getting compression. Aug 9, 2021 · I recently purchased an ‘02 KX85 that didn’t run when I bought it. How To Test Compression On A 2 Stroke Dirt Bike. Not sure if that's related though. Before the top end rebuild (weisco btw), it had about 30 psi and after the rebuild it’s at like 35-40 psi. It runs and idles, but when I take off, it bogs down and dies. Are you saying a 4-stroke engine +needs+ to have a carburetor in place to get a proper compression reading? New to the forum, be easy on me. Jul 6, 2023 · 🔧🔧 AMAZON STORE: https://www. 6 to 13. Just trying to get ideas before I take it apart. Apr 6, 2010 · Anyone with more insight on the new 2017+ 2-stroke KTM Husky? I've just bought a 2017 2-stroke w 22 hours on the meter. I can't find any spec info for compression on this trimmer online, and the manuals I found don't give me much. You can push the kickstarter down with your hand easily, but we did not do a compression test. and i highly doubt this was a scam. It had been poorly maintained. His 01 YZ 125 died and he thought he fouled the plug. As far as I know there really isn't much damage your gonna cause by running it with low compression. com/2-stroke-mistakes/If you already watched part 1 on the symptoms of 2 stroke low I've never seen a need to do a compression test when fixing a small 2-stroke on hand-held outdoor power equipment. When you let the revs off the stroke will come back up. Sep 18, 2009 · The compression gauge will only tell you "secondary compression". Jun 14, 2019 · 88 EZGO Marathon 2 stroke help w/compression: Gas EZGO: 1988 ezgo 2 stroke to 4 stroke questions: Big Block Talk! 86 Ezgo stroke low compression: Gas EZGO: 85 ezgo 2 stroke lost compression: Gas EZGO: 1988 2 Stroke No Start, low compression-please advise: Gas EZGO Dec 6, 2024 · Common 2 stroke low compression symptoms are: Hard to start; Spark plug fouling; Low power; Engine turns (kicks) over very easily; How long does a 2 stroke top-end last? A 2 stroke top-end can last as little as 5 hours to as much as 200+ hours before needing a rebuild; it really depends on how you ride it and maintain it. Compression is 100psi. Edited December 3, 2014 by Shackleton. I would pull the muffler and take a peek at the piston to see if it is badly scored. Compression test values should be close to brand new. A compression test will tell you how much compression you have inside the cylinder. I checked the spark plug, cylinder head, and jug for torque, all good. Jan 9, 2010 · This newb needs some more help. 795 wiseco piston . Apr 6, 2006 · haha yea people like that, last night on ebay i bought about $100-$150 worth of stuff for only bout $12. The rate Oct 10, 2019 · No valve adjustment on the 2-strokers. MH Dec 8, 2010 · Just checked the compression on my newly acquired 98 kx250. I was a little surprised to see that the compression is about 215 psi. In situations like these, a compression check can indicate if cylinders are working or not. So: I did compression test and found no compression on the one cylinder. It's impossible to say without being there. Step by step I go through the most common problems an Dec 3, 2016 · on two stroke a compression test is quick easy and painless. With the spark plug in it has so much compression that I can barely get a full kick in before it stops my foot. 5 rides ago (all woods with lots of sing Oct 25, 2009 · ford told him there was no compression on number 2 cyl 08 f250 king ranch 4x4 innovative 3. Oct 9, 2012 · Last time I rode was in the beginning of June. Dec 5, 2020 · I ran to harbor freight and purchased an inexpensive compression tester to try to rule out compression as a reason for the no-start. Looking up the exhaust and in the intake, everything looks great and there is plenty of resistance on the kickstart. Crank is fine and the piston and cylinder wall is in good condition. My cr125 was taking longer to start. The compression is insane. com/shop/drewfixit 🔧🔧In this video I show you how to Compression Test Victa 2 Stroke Lawn Mowers. The cylinder was in pretty good condition and I was able to throw in a new Wiseco top-end kit into it with a new piston and ring. 110 psi doesn't seem bad for a 50cc bike though. Nov 16, 2004 · Check it 2-3 times, then add a teaspoon of 2-stroke oil in the plug hole, wait a couple secs then test again. the person has all positive feedback. It's possible that you caught it in time and just need to have some top end motor work done. Jun 14, 2022 · Just finished putting in a new piston and rings on honda cr250 for my first time and now it has no compression and won’t start, not sure what happened put everything back how I took it apart Is it possible that this could happen if the bottom of the exhaust valve didn’t line up when putting the c The typical effective compression ratio for most 2-stroke engines is 6. Maybe needs Oct 8, 2015 · I know 60psi is definitely low for a regular 2 stroke. 5:1 as standard, and compression drops if the engine is tuned by raising the top of the exhaust port. If it breaks into more than two pieces, one may escape through the exhaust, leaving the motor with low compression. FYI non of the reb Jul 24, 2016 · Low compression on a cylinder is an indication of a bigger issue. Should I have honed it? Rings not seat nicely? Im thinking of ripping it down and getting it honed. FWIW, a stock, healthy 250 2T with proper piston-cylinder clearance can push over 200 PSI. Apr 16, 2012 · I have worked on cars and 2 stroke motorcycles most of my life, but never tore into an outboard. The arrester (which is a screen) gets clogged up from the oil/fuel mix. Common symptoms include: Reduced power output from the engine; Poor acceleration; Lack of response when stepping on the gas pedal; Misfiring or backfiring sounds coming from Dec 16, 2017 · So I am rebuilding my 2007 rm 85 I rode it for a good 8 hours and started noticing low compression so I'm like I going to rebuild this bike so I start remember this is my first time rebuilding anything I follow instructions , finish and I fill it up with coolant and it's leaking so bought new gas Nov 28, 2024 · Note on the 2. Dec 3, 2024 · A 250cc 2 stroke should have 170 PSI or more and 210 PSI when new. but anyway this person didnt know what they have, they listed everything under kxt 250 and didnt mention tecate in it, which most people know tecate instead of kxt250, so i got a carb, throttle and throttle cable Jun 13, 2015 · Boys, I'm bitter the girl's not running. Primary, secondary and running. This is the first video. Remember the air has to get into the bottom end first, then gets transferred up to the comb. I saw a thread about what one can do if the compression is low for a 4 stroke but wanted to inquire about what I should/do now. The problem im having is that when I try to kick it. I have replaced the top end twice and had it honed and replated by Power Seal, but the bike still reads only 80 psi. I have no problem rebuilding I've don't alot of work on my 4 strokes this is my first 2 smoker. Checking Dirt Bike Compression Like a Pro Jun 21, 2015 · on a 4 cycle motor no, but a 2 cycle yes you can no carb no reeds no problem for compression check, only running. Jun 13, 2009 · Re: 1981 Johnson 70HP No Compression Probable that someone removed the cylinder head for inspection and did not replace it with a new head gasket and torque it properly. So took the motor out and did a bottom end rebuild for safe measures, the top end looked good, rings looked right. :Clap: Not really compression so to speak, but it will affect gas fuel mixtures and intake cycling. The Combustion Cycle A 2-stroke engine's cycle comprises two main stages: compression and combustion. A KT100 will pump 160 psi. Lol) but that's with a lot higher compression ratio. Jun 27, 2020 · I rebuilt the bottom and top end on my ‘01 kx250 and last summer I fired it up but than got sidetracked. read 150psi after 6 kicks. A leak down tester Feb 21, 2021 · YZ250 Question: Just rebuilt the top end on a 2015 YZ250 with a Vertex piston. Mar 9, 2020 · Off with the inspection cover (one with breather) on left side of cylinder - 2 x 6mm bolts. Then at the next stop I went to start it again and there no compression at all. Jan 19, 2010 · Long story short: gp1200r '00 model basically doesn't want to go above 20mph and sounds terrible. g. Apr 6, 2024 · Now I have 2 other problems that have come up. It's Nice to communicate with someone who has more between the ears than MASHED POTATO'S. Jun 18, 2008 · My son was racing a hare scramble race on Sunday. This assumes the engine is warm and the throttle valves are open far enough to admit enough air for the pistons to compress the air. rebuilt the top end. Still no improvement on compression feel through the kicker. Anyone want to speculate on what the problem might be? Longer version of the story: Dec 28, 2016 · I have a 02 YZ85 that I have been running Yama lube in for the past year. I take a compression reading after break-in, then use future compression readings as a baseline and will begin budgeting at around 10% loss of compression. The seller said they tried to put a new piston and rings to no avail. I put a new plug in last night and it would not start. the owner said the top and bottom were done 15 hours ago. Oct 9, 2020 · The most likely reason why a two-stroke engine has lost compression is an issue with the piston or piston rings. There was very low compression when i tried to start it. Compression readings will also vary from gauge to gauge, depending on where the 1-way valve is located and depth of threads. i said somtin wrong with my tester and i decide to use it on my tri z 250 and i get 150 psi (everything stock ). New bottom end, new top end, fully cleaned the carb, exhaust- pretty much everything. 035 milled head, K&N intake adaptor and filter, Trinity pipes (for now Mar 21, 2023 · 2-stroke engines can have quite low compression (worn out) and still be relatively easy to start but, performance would suffer. This is static compression, which you measure with a compression gauge. The rubber cone prolly not sealing well. I don't see it starting with compression so low. 6:1, so 14. took the cylinder off again and have no noticed some very fine scuffs around the bottom of the bore that rests in the crank, you can only see them, cant feel anything when you touch (i know thats not very accurate but just giving an idea of the scuffs) measured it again and still in tolerance, but i am only using a vernier May 29, 2018 · I have a 2001 LX250TXRZ with 120psi on al cylinders except bottom on port side which is 65psi. It bogged all the way back to the truck but made it back. Compression is 50 psi and is [FREE Guide] Top Mistakes 2 Stroke Owners Make - https://motocrosshideout. The next week I went trail riding and initially the bike ran like a top! After Feb 24, 2024 · Even if it was running perfectly / had good compression, you'd want to get rid of that Namura piston ASAP, bad rep & many failures / quality issues reported with them over the years. Its best with 120psi but they will run at 90 psi. There shouldn’t be a detonation problem until the compression is pushed up & also more cylinder heat. There feels like no compression. Advertisement Causes of Low Compression Diagnosing Low Compression Addressing Low Compression By understanding the common causes of low compression in 2-stroke small engines and Signs of lost compression include decreased power or difficulty starting. It has a new head gasket and new piston and rings, which under visual inspection ap Sep 2, 2020 · Hi Guys, I have an 02' CR125r. When I pulled the cylinder the r Nov 27, 2017 · Bought a kx 85 taken apart that needed a new top end. If there is a crack in the piston, air can escape and cause a lack of compression. Jan 23, 2010 · Keith72 is right, you could get gauge that threads. I pulled the plug and cleaned it the best I could, put it back on and got it to pop start. This animation shows a 2-stroke motor at work: Dec 23, 2020 · I don't get why my compression is only 37psi after a top-end rebuild! 1988 Yamaha BW80 (same engine as the PW80 for all years). I have also rebuilt the carb, replaced the crank seals Oct 8, 2021 · Hi, so I have a 85, its only a year old from the showroom. A good TT 75, with a good snap-on gauge, measures 215 psi. Oct 12, 2014 · Well you need a compression tester which screws a hose into your spark plug hole and there is a dial on the other end that tells how many psi of compression your engine puts out. Considering it's a nearly 40 year old bike with an unknown maintenance history, Aug 30, 2008 · ok, i put in another plug today, still no joy, hardley any compression. One I bought a compression tester and got 175 psi on a cold engine and 200 psi after I put some oil down the spark plug port. Checked compression and consistently got 85 psi. It's just a simple 2-stroke engine so I don't know what's going on here. I'll prolly end up rebuilding the top for the guy. I was wondering, how do you know if a 2 stroke engine is running too high a compression ratio? Jan 8, 2021 · I have no experience with that engine so hard to evaluate if your compression pressure is correct or not. Bottom end was built recently. Install two new crank seals while you have it on the workbench. That gasket is still bright green. They usually run 160 on a fresh cylinder and piston. the bike has no compression at all doesn’t start after like 40 kicks if anyone knows what it could possibly be lmk will be appreciated, carb might need to be cleaned as to gas was coming out w petcock on Mar 1, 2022 · Some small 2-stroke engines may be harder to start when hot if their compression is low, so always check the compression levels before restarting the machine. 6 = ~96 psi. Jul 8, 2021 · The transfer ports close about 30 degrees before the exhaust port, regardless of throttle opening you will have ambient pressure in the cylinder when the exhaust port closes and compression begins. Compression isn't a good way to test engine wear. 75 HP Lawn Boy Silver series that will not start. Starts for just a second then dies. This video shows simple steps to diagnose and repair your 2 stroke small engine when it will not start. Rode it for the first time, ran perfect for about 2 hours, trying to slowly break everything in, and then it just sh May 21, 2009 · I have the exact same symptoms on my atv 2 strke motor. 2007 RM 250. Going by what you said, I would say your engine has low compression. Is Nov 14, 2010 · Just rebuilt my top end on my 06 yz 125. It should be around 130-150 so does an Dec 24, 2016 · My 1997 RMX250 was only hitting 90 psi compression. It seems like the consensus on some youtube videos is that 2-stroke needs AT LEAST 90, but preferably 100+ to run. Some 2 strokes have power valves which are not the same thing as normal 4 stroke valves. The previous owner may have used a bad gas mix before he hit the paper. At the time the oring behind the sprocket fell out and it fired up ok but immediately redlined and only way to shut off was to turn the gas off. I was wondering if she is in need of a immediate top end rebuild. dose the compression seem too low for that amount of hours? I figured roughly -10% for 20 hours? I read the compression should be around 175-200 on a fresh rebuild. Just a thought. Eventually it wouldnt start at all. any help would be appreciated. There are 3 types of compression that occur in a 2 stroke engine. The compression is not necessarily a problem. Dec 3, 2014 · No idea on the history of the bike. maybe the crank seals are blown Apr 11, 2009 · hi guys i just rebuild my engine with these mod +4 mm cranckshaft . You screw this thing in then kick the motor over with the throttle wide open like 6 or 7 times then check what the dial says. I recently rebuilt the top end (new piston / rings / gaskets) and checked the tolerance of the cylinder to confirm correct piston size. It was a bit hard to g Mar 12, 2015 · Rebuild top end on my cr85 and it lost compression. The top end only has like 5 hours on it. with a compression or leak-down tester) as the 2. 21cc dome with cool head . Jul 7, 2018 · Changed top end about a year ago but now I've gone ahead and try to rebuild the entire bike. I went through the entire fuel system and the bike fired right up but had considerable knocking. Feb 23, 2014 · At 145 psi you are ok for a yz85. Typical figures are around 10:1 with the PV closed and 8. so my question is, can bad crank bearing and seals cause NO comp? Sep 9, 2024 · Low compression is a common issue in 2-stroke small engines, leading to decreased performance, fuel consumption, and power. My piston was fine. When I take the spark plug out it kicks over freely like it should. No compression i can move the kick starter with my fingers. 6. Specifically, I am Jul 14, 2012 · I personally don't ever use a compression guage when workin' on 2 stroke stuff! If rings didn't do the trick , then the problem lies elsewhere, such as seals, piston, worn bore at the bottom, etc. To get home I push started it. yet the compression was good and the leakage rate above 70%. Bike started and ran great right after the rebuild. amazon. 4, you can't test compression like you would conventionally (e. Compression refers to how much power an engine can produce, and low compression means that it’s having trouble pushing out enough power. A two-stroke cylinder engine should have a compression reading of 110-130PSI. These Oct 29, 2021 · You typically get two compression ratios for a 2-stroke, a higher one with the power valve closed (low-mid RPM) and a lower one with the power valve open (high RPM). From memory, the RD350LC (RZ350 in the USA) ran at about 6. Then did compression test and it was good- thenwhen to start it and compression was way low and no start or attempt to fire. Checking the compression on a 2 stroke is actually pretty easy and doesn't take long. I'm thinking a cold seizure but I'm not sure. Apr 15, 2024 · This is a 2 part series. But I don't have a manual for it. Apr 22, 2013 · I have a YZ144 done by Eric Gorr and ported for low/mid powerband and pump gas. Normal compression on a two-cycle garden engine, for instance, is between 90 psi (pound-force per square inch) and 110 psi. 012 carb has been cleaned, floats at the right level, gas mix Sep 29, 2019 · Hello everyone I bought a 2006 ktm 250xc and the previous owner fully rebuilt the whole engine and it had plenty of compression, I broke the bike in and then took it to sand mountain, after 2 days of ridding I had lost all my compression and I can move the kick starter with 1 finger but the bike Jan 4, 2017 · Even then I would still take the top end off and measure the cylinder/ inspect it for damage to the cylinder like gouging. Piston rings are rigid enough that this usually isn't a problem, but it is a weak point, and the piston ring may break there. ( I have a Ktm 125sx that won't even push start at 120psi. Start the bike and give it a hard rev - without going into great detail, you'll see a part with a stroke in it moving down from above the inspection window aperture and disappear down the bottom. I have never done a leak down test on a 2 stroke. 5:1 with the PV open. 7 psi at sea level X 6. Are you using a screw in tester that will hold the reading until you release it? Dec 31, 2011 · No advanced warning (noise, performance or loss of cranking compression) either. I have a well used and well behaved 2 stroke 4. Is this nor Oct 19, 2015 · EZGO Marathon - 4 stroke: Golf Carts and Parts: 1990 marathon 2 stroke with low compression: Gas EZGO: 86 Ezgo stroke low compression: Gas EZGO: 85 ezgo 2 stroke lost compression: Gas EZGO: How to check compression on a 2 stroke: Gas EZGO Aug 1, 2014 · Since the 2 stroke has ports the uncorrected compression is invalid. No power valve in existence can seal well enough to build compression before the port itself actually closes at compression testing RPM. 2. 4 will always show low compression unless it's tested in a specific way. Anyway, you need more compression to really make your machine perform. 0l fx4 reg cab black 6" lift studded and deleted, king ranch seats Jul 3, 2019 · I just picked up an 01 KX125 a few weeks ago that had low compression. The open up at higher rpm’s to allow more exhaust to flow and close at lower rpm’s to help low end power. Tranny side seals usually will show issues like increased smoke or crankcase oil going missing. The cylinder Feb 23, 2024 · I have a 1993 RM 125, and the bike is not holding compression. 012 carb has been cleaned, floats at the right level, gas mix Jul 11, 2019 · Started losing compression and I rebuilt it before any real damage occurred, but now I have 90# compression after the rebuild and the bike will not start obviously. But don’t worry, diagnosing the cause of compression loss is the first step to fixing the problem. If the difference is more than 10-15%, change the rings. ct Oct 2, 2006 · NO COMPRESSION The top end had been rebuilt 120 miles ago, Piston and Components rebored the cylinder and i fitted a new oversize piston, rings, gudgion pin and the circlip type things that hold it in and also a new small end bearing. 2 stroke rings are notched for a pinned piston (or at least they used to be). So this engine technically does have valves but would not affect the compression that much if at all due to where they are located. If I put a good bit of force into it I can push it down with one finger curled around the kicker and my otc tester is reading like 130-134 psi of compression. This seems high to me. The cylinder was nicely coated in 2 stroke before assembly. + 4 mm cylinder plate . Cylinder looks good. Now we know you have compression but if your having issues with the bike you can have a air leak. Depends on how bad the leak is. It ran right after the new top end. Anything beyond 120 psi is already too high. Included below is a picture May 30, 2007 · 2 stroke engines have a spark arrester in the exhaust. . after putting the new pison in and put the cylinder and cyl Jan 29, 2017 · 90PSI = no compression should be looking at least 140psi 180-200 for a high compression engine maybe they bored it out of spec for the new wiseco piston ?. Piston rings extend or push outward against the cylinder walls, resulting in a vacuum seal. By Joe Motocross, March 1, 2016 in Honda 2 Jul 23, 2022 · So, if you find your compression to be low in one or more cylinders, it’d mean your engine isn’t running well. Any help? Oct 8, 2020 · Test the Compression System. The results show that actual fuel consumption can improve by 1-3% for each unit increase of compression ratio over the compression ratio range of 6. If that's changed, you need to check them. However, I'm sure other guys with more two stroke experience will chime in shortly. During the compression stroke, the piston moves upwards, compressing the air-fuel mixture in the combustion chamber. Understanding the underlying causes can help diagnose and address the problem effectively. Motor runs fine. I've measured compression readings shortly after a cr250 rebuild and then Mar 1, 2016 · Honda 2 Stroke '02 CR80 compression Facebook; Twitter; Youtube; Instagram; Pinterest; Newsletter '02 CR80 compression. Runs for a while until it heats Dec 3, 2014 · No idea on the history of the bike. Last summer I did a full overhaul on it. I cannot tell you how many 4 strokes have passed a compression test with leaking heads,leaking valves and stuck rings due to carbon. This method of dry assembly allows ring seating without the risk of ring glazing due to the assembly oil used. Jul 14, 2007 · I've heard that when doing a compression test on a 2-stroke you should hold throttle open. Mixed Apr 19, 2004 · 2 stroke compression is cut and dry once the piston rings pass the top of the cylinder ports. I can't recall the specifics (there's a couple YT videos on the subject) but due to the Multiair design, the 2. The piston is the part of the engine that creates the compression needed to run. Unfortunately, your budget and use of the engine do not determine it needing a seal or not. And was wondering what the spec for the compression is supposed I be. There are no valves so all your checking with a compression test is the piston rings and cylinder wall, there are other/better ways to do that and they don't require the expense of a compression tester. I stopped to make sure nothing was loose and when I went to start it there was veer little compression but it ran. cylinder walls have no scaring and the old piston was clean as well. Apr 2, 2020 · Decided to kick over bike month after rebuild has new piston,cylinder,spark plugs, rads etc. on a 4 stroke it is a teat on a boar hog. A lack of compression will likely require the aforementioned Leak-down test kit to diagnose the root cause. I was reading 30psi before the rebuild, then I replaced the cylinder head, cylinder, piston, and Jan 9, 2011 · ok, so i recently aqquired a ke100, a two stroke 100cc dual sporter, and the guy said it needs crank bearings and seals, so today i bought it and pulled the cylinder and the piston is totally messed up. chamber. It had great compression and was able to get the bike running with it in. thanks for y all answer Aug 19, 2013 · Re: 90 PSI compression on a Robin 244cc 2 stroke, good or bad I agree with 1fast67, but if it seems to be running good then I'd go with it now. After i got it all put together, the compression dropped t Mar 1, 2011 · Model TB4BP, 4 stroke, Engine/Motor 32cc, 4-cycle full-crank Choke System 1-2-3 choke Speed Settings Variable Airflow Velocity 150 mph Airflow Volume 475 cfm TB4BP 4-Cycle Backpack Gas Leaf Blower by Troy-Bilt Just bought last summer- died in fall. Nov 26, 2023 · Symptoms of Low Compression in 2 Cylinders. I have searched through this forum and found some great info but wanted to throw this out to those of you who are more experienced. 03 tuned,5" straight pipe,fully deleted, leveled on 35's, 20x10 -12, cac pipe,diesel site coolant filter sold 05 xlt f250 6. but the mods I can see are a platinum 2 pipe and fmf power core 2. Dealer says the first cylinder has no compression, and they need to open her up to find out the problem. Due to the conditions and him being a beginner he dropped out of the race. Additionally it does not idle well at all and stalls unless it's revved excessively. After 2nd ride pulled the piston out and it had a deep scratch on the right side of it. Dec 5, 2011 · I was out trail riding my 2002 yz 125 when I heard a rattle. Do you think I need to take the top end back off and inspect the cylinder and rings again? (All new piston and rings) Feb 23, 2021 · just recently put a new wesco pison kit in my bike and now it doesnt want to start, was running just fine about 8 days ago and feels like it has barely any compression. I'm thinking about buying a compression tester if this Feb 2, 2014 · I would expect to see a 2 stroke with compression of at least 90 psi. And also there is no way that a bike would ever run on 30 psi so I am almost certain that compression tester is not reading correctly of since starting the bike it you damaged it to sufficiently lower the compression to 30psi. Time for a rebuild if compression is what you say. I recently rebuilt the top end on my rm250 and this morning when i went to kick it over it had no compression. Is that true across the board?. Mar 7, 2020 · My ~1990 Yamaha 5HP 2-stroke (model 5CS) has low compression at around 70-90psi. lzfoh nuyfem yczqvuh cwqpbk pism jlwlstu tpcwb kzttews ktk rin