cold compression test yz125|YZ125 and YZ250 Compression Testing : dealers How to do a compression test on a YZ125. This procedure will also work on other carbureted 2 stroke dirt bikes, but check your service manual for correct co.
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I'm using a compression gauge that has a ten inch flex hose, so it could increase the total volume of the combustion chamber and lower the reading. However, it has a valve in . I'm looking for the "safe psi range" for both the 2012 YZ125 and 2012 YZ250 compression. I'd like to base my rebuilds on how the compression reads if that's a smart .
Did a compression test on my 2002 yz125 first compression test cold (6 degrees outside. in that weird temperature you southerners use it's 43) and got.
engine compression ratio test
Compression on a 125 should be above 150 at least. Don't rely on compression testing to check top end woes. Tear down the top end and measure the cylinder, piston and . My first question would be, did you hold the throttle WOT while doing the test? This has a huge effect on cylinder fill and compression number. Just went thru this last week with . How to do a compression test on a YZ125. This procedure will also work on other carbureted 2 stroke dirt bikes, but check your service manual for correct co. I have had a lot of people ask me how to do a compression test so I decided to make you a video explaining step by step.
A cold 125 motor in good heath should be showing at least 160psi. It'll run with considerably lower pressure, but you risk causing damage. An optimal motor will have over .
yz125 compression
Low compression on a two stroke is a bad gasket somewhere, worn, improperly seated or stuck rings , bad test method or bad compression tester. You cant tell if a ring is . I have had a lot of people ask me how to do a compression test so I decided to make you a video explaining step by step. Enjoy!Follow us on Instagram: MintyM.
This motorcycle has massive changes for 2023. It is based on the YZ125 motocross bike which had massive changes last year, so it follows in those footsteps with a mostly new motor, and completely new bodywork. The . OK, i have had my 02 Yz 125 for about 3-4 months now (moved up from honda 230) and i just got back from a trip to WV and im doing some basic maint. on the bike (dump gear oil, clean air filter, new rear tube and tire, brake fluid) and last night while i had the bike apart i decided to do a compression test, and i tested it 3 times and always got a reading of 105-110 .
Even with the much-improved six-speed transmission we still tested different rear sprockets on the 2005 YZ125, but unlike in years past, Yamaha shipped the 2005 YZ125 with good gearing.
Suzuki GN 125 cold engine compression test for future reference in a no start situation. Start to check out the easy start with the compression figure. So I . I checked my compression on my YZ 125, 145 PSI. I just bought the bike, and me and my father are going over the whole bike. My repair book said that the compression should be around 120 PSI for a good result. If it is higher, there could be carbon build up, I didn't want to take apart the top.
Does any one know how many PSI the compression is supposed to be at on an 06 yz 125? I have a compression tester and need to know. Jump to content. Yamaha 2 Stroke; Activity. All Activity; TT Picks; Podium; Search; . Cracks in a piston will not show up on a compression test. I suggest replacing the piston and rings every 50 or so hours. Link .
I just purchased a YZ 125 (2002) and it won't kickstart when cold. Will bump start fairly easy and will warm up with a very high idle. Lots of smoke from exhaust. (I'm running 32:1 mix). It will start right up after it has warmed up. Compression good, has a new top end (per former owner). Could t. Hi I have a yamaha tzr 125 1991. I done a compression test and it read 80psi, so I had a spare bore slightly smaller than the one I was running and stuck a wiseco 57mm piston in it. . Anytime someone mentions they can start a cold 2-stroke without the choke, . Comparatively a YZ125 motocross has about 160-180psi on a new piston & ring, 2002 yz125 compression. Thread starter tyler_43; Start date Feb 14, 2008 . for a manual. I would be guessing somewhere over 160 psi. This can be deceiving on ring and piston wear. Normally for a compression tool to be effective you should have a fresh top end, then record your reading and check every so often. . A cold 125 motor in good .
How to do a compression test on a YZ125. This procedure will also work on other carbureted 2 stroke dirt bikes, but check your service manual for correct co. For hardcore racing, we ran this setup on the 2022 Yamaha YZ125 (stock clickers are in parentheses): Spring rate: 48 N/mm Race sag: 100mm Hi-compression: 1-1/2 turns out Lo-compression: 12 clicks .
engine compression ratio tester
KAYABA SSS SHOCK SETTINGS For hardcore racing, we ran this setup on the 2018 Yamaha YZ125 (stock clickers are in parentheses): Spring rate: 4.7 kg/mm Race sag: 100mm (105mm) Hi-compression: 1-1/2 . YZ 125 Compression test; By Bill_B, March 2, 2018 in Yamaha 2 Stroke. Share More sharing options. Followers 0. Recommended Posts. Bill_B. Posted March 2, 2018. Bill_B. Members; 1.9k Location: California; Share; Posted March 2, 2018. I have a compression tester with standard thread length. The bikes plug is .280 longer than the tester fitting is.We understand both views. The fact remains, however, that riding the 2022 Yamaha YZ 125 is the most fun you can have on two wheels. You can’t possibly dislike the bike, no matter who you are and what you ride. Most things about . KAYABA SSS SHOCK SETTINGS For hardcore racing, we ran this setup on the 2017 Yamaha YZ125 (stock clickers are in parentheses): Spring rate: 4.7 kg/mm Race sag: 100mm (105mm) Hi-compression: 1-1/2 .
Kick the kick-starter over quickly with 5 strong kicks (only test on a cold engine that hasn’t been run in the past 6 hours). Check the compression PSI number of the tester gauge. It’s really that simple to test the . Probably your best source is the video/article where MXA compared the previous gen yz125 with the current gen. The main differences they found (less power down low, more power up top, taller seat) are likely to be reflected in the X models. Not sure if the new x got the stiffer spring rates that the YZ did.
Yamaha YZ125 Compression Test
YZ125 and YZ250 Compression Testing
Wet compression test is putting a small amount ( 1/2 teaspoon) of oil into the cylinder and the do the compression test. You reading should be higher than the dry test. You do need to have the cylinder measured. So if the bike cranks up easy and runs good, then what is the issue? Low power out put at your elevation? What does your spark plug . But i came across a compression tester on ebay for like 20 dollars, and after opening the box i imediatly regretted the purchase. So i thought i would go give it a test, and i knew that a 250 should have around 240 psi compression, this stupid thing only reads 125 psi. Is it even possible to have compression that low and have the bike still run? I mean IMO the only accurate way to perform a compression test would mean I'd warm my bike up to operating temps, drain the bowl, and then run a compression test. . If wrench for a living then you should know you do compression tests when the bike is cold. +1 with throttle wide open never warm!! . Stock 2006 YZ 125 Theme . Light Mode . cold compression hard low starts. Jump to Latest . (Mine) 2001 Yamaha YZ 125 With Wisco BBK,Graphics Kit,CEET Seat Cover,Scott Grips,Throttle Jocky Throttle,Jet Kit. (Mine)1999 Suzuki 300 KingQuad Snorkeld . Do a compression test first, 163 lbs is minimum. If it fails, I'd loosen off the valves and have someone crank it by hand listen for .
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The combustion chamber has a 7-percent increase in volume, and the compression ratio is either lower or higher, depending on the position of the power valve. When the power valve is closed, the corrected compression ratio is 10.21:1, which is a 5-percent reduction. With the power valve open, it’s 7.81:1, which is a 1-percent increase. YZ125 Idle extremely high Facebook; Twitter; Youtube; Instagram; Pinterest; Newsletter; YZ125 Idle extremely high. By Henry Johnson, July 5, 2019 in Yamaha 2 Stroke. Share . Doing a compression test alone provided good results and no pressure drop at all, still. Due to the frame, it’s really hard to even do that.BUT, I did a compression test with my new compression tool and it read 120 psi – I kicked it several times. So, with that, I popped off the head and the cylinder and lo and behold my piston looks almost brand new and ring as well. Gaskets look good. I torqued it down to spec last time I rebuilt it, which was probably less than 10 riding hours .
2025 YZ125 SPECIFICATIONS. ENGINE. Engine Type: 125cc liquid-cooled 2-stroke; reed-valve inducted Bore x Stroke: 54.0mm x 54.5mm Compression Ratio: 8.2~10.1:1 Fuel Delivery: Hitachi Astemo® Keihin PWK38S carburetor Transmission: Constant-mesh 6-speed; multiplate wet clutch Final Drive: Chain Fuel Capacity: compression test maybe? is it running poorly once you get it going? Post Reply. O. osanna. Member. Apr 30, 2007 2 0. . Post Reply. O. olderndirtmom. Member. Apr 28, 2007 424 1. May 1, 2007 #7 osanna said: I have a Yz 125 that wont start when it comes to race time! . my CR wont start when cold if I kick it hard. A very gentle kick and it .
What should compression be in a YZ125???
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cold compression test yz125|YZ125 and YZ250 Compression Testing