03 yz125 compression test|What should compression be in a YZ125??? : exporting My stock 2005 yz125 after breaking read 165-166psi. I don't think it matters much but I don't think you need to disconect the carb. Just hold the throttle open and the kill button . Resultado da 7 de jul. de 2023 · "qual sua opinião sobre a menina que cortou a boca pra ficar igual o Sanzu?" #kkkkkkkkkkkkkkk #memes #qual #sua #opinião #sobre #menina #que #cortou #boca #pra #ficar #igual. 1 comment. Eu esperava um corte maior. Aylo 7 jul 2023. 1. PeixotoFish . 22 apr 2022. 13.1K 117. .
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My stock 2005 yz125 after breaking read 165-166psi. I don't think it matters much but I don't think you need to disconect the carb. Just hold the throttle open and the kill button .I'm using a compression gauge that has a ten inch flex hose, so it could increase . 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 . 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.
Compression Testing 2-stroke Dirt Bikes. 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.
But look, a compression test is for setting your baseline and later comparing to your baseline. (E.g., piston/ring wear lowering compression or head work raising compression.) Just use the same gauge at the same altitude . 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. . Do a compression test after breaking them in so you have an idea of what it should be. Use that number as a comparison to values as you put hours on the motor. I .
First thing to do is a compression test and a leak test. If both show ok, then clean the carb. When jetting gets to be confusing there is normally another reason causing this issue.
If you are doing a leakdown test where you plug the intake and exhaust you pressurize to about 6 psi. It should hold for a few minutes. A loss of 1 or more psi in a minute . 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 . 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 . Yamaha YZ 125 - Test Ride & Review - Dirt Rider. By editorial staff. April 9, 2009. More Tests. . 2025 Dirt Rider 450 Motocross Bike Comparison Test. Tests. Best Motocross Bike Winner—2025 .
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 .Built around a bulletproof 124cc liquid-cooled 2-stroke lump, the 2003 YZ125 is a great step toward the high-performance machines, offering a great basis for solid training ahead of the real deal. 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? 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 .
Brad Daugherty/6'0"/165 lb/IntermediateThe 2004 YZ125 wasn't all that different from the '03 model. The only big changes that I felt were from the bottom- and top-end performance and the fork.
what is the compression in a 02 yz125?
Yamaha YZ125 Compression Test
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.
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 .
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.
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 suspension is also updated just as the YZ125 motocross bike was. The fact that this bike even exists is a big win for us. 2005 was the first year Yamaha went to an aluminum frame on their YZ125. It hasn’t changed since. The year was 1996 and Yamaha had unleashed a monster of a 125 after years of tiddler mediocrity. Hi I have an 03 250f and need to know what the compression should be. I have only reshimmed the valves never replaced the rings. . Your tests should eventually even out at some number - I got 90 psi from 4 different tests for my 06 YZ250F, each test comprised of 20 kicks. Link to comment Share on other sites. More sharing options . Want to make your YZ125 faster? Whether you’re looking to build the fastest 125 2 stroke or just want a powerful and light trail bike, this guide will cover the top 7 YZ125 mods you can do that will actually make a difference.. .
I'm purchasing a leftover 06 125 for MX. I notice the Yamaha specs for the 06 YZ125 indicate that the compression ratio is 8.6:1 - 11.0:1. That is a broad range. I would like to know specifically from the factory is it 8.6:1, 11.0:1, or somewhere in between? I would think there is a baseline. Tha. So I noticed its, really easy to kick start the bike. I'm not sure if this is normal because this is my first two stroke. Any help would be useful.
I have an rm125-03 I have bought all the parts to do a top end rebuild!! But i don't ride all that hard. I raly take it out of third w/ full throttle. I just bought a compression tester for it but the book dosn't say anything about what the compression should be. I did a good break in of the engine. it has about 15-17 hours on it. When do the test. The compression has been reduced to 8.8:1 compared to 10.7:1 on the YZ125 motocross head. Yamaha achieved this in a novel way, raising the spark plug 3mm in the head, using the same casting but . The YZ125 is a fun bike, and the aftermarket has an abundance of upgrades for it; however, if you’re a serious racer, it’ll take a lot of work to get your YZ125 to run like the GasGas MC125 .
An update of my bike ,Blew the top end I could probably still start it so it's not blown but it has absolutely no compression :( ,Time to rebuild her again S. I just measured our stock 05 TTR-125LE at 154 PSI. Prior to heating up the engine I measured the valve lash and the exhaust valve was in spec at .005in (spec is .0039 - .0055in) and the intake valve was out of spec at .0015in(spec is .0031 - .0047in).MT-03. ,999* (MSRP) EXPLORE HYPER NAKED EXPLORE. × CLOSE BACK. BOLT R-SPEC. ,899* (MSRP) XSR900. $ . 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 .
Hey guys, I just did a compression test on my bike. I did the test as per the compression test kit instructions (about 5 good kick's to the engine), and i came out around 115 PSI. I don't have a shop manual so i'm not sure if i'm in the ballpark of having good compression. . As an example my YZ125 sees 20 hours of recreational MX track usage . All the changes add three pounds to the wet weight of the 2023 Yamaha YZ125. It tips the scales at 212 pounds with the tank topped off with premix. The GNCC-aimed 2023 Yamaha YZ125X gets a 0 .
Suspension is an area Yamaha motocross motorcycles have really shined the last several years, and the 2018 Yamaha YZ125 has a KYB SSS (Speed Sensitive System) front fork, along with a KYB shock .
The TSP cylinder head for the Yamaha YZ 125 is higher compression than the stock head but still safe for 91 octane pump fuel with appropriate jetting. It offers improved bottom/mid-range power over the stock head and is best suited to trail riding, offroad racing or MX riders who want max mid-range torque. It is also recommended for the YZ125X .
YZ125 compression testing.
YZ125 and YZ250 Compression Testing
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03 yz125 compression test|What should compression be in a YZ125???