2002 yz125 compression test|YZ125 Low Compression : purchasers 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 . web28 de ago. de 2023 · Playtime Co. was once the king of the toy manufacturing industry. until everybody inside of the factory one day disappeared into thin air. Now, years later, you must explore the .
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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 .
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hey guys, i have a 2002 yz 125, what is a good compression for a 125? i got 120psi. what is the best? 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 . 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.
yz125 compression
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. 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 .
Normally for a compression tool to be effective you should have a fresh top end, then record your reading and check every so often. When you see a drop, then you know its . 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. 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. . Picked up an 02 yz125 and the first thing I did was a compression test, which came up pretty low at 90psi. Bike was supposed to have a new top end with less than 1/hr on it. Anyways.
what is the compression in a 02 yz125?
Yamaha YZ125 Compression Test
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?
Small bikes can provide big fun, and the best way to test this truth is to ride the 2002 YZ125. A brawny 124cc liquid-cooled 2-stroke engine delivers more punch than you'd expect, and manual 5 .
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 thing to do. Any info/insight is greatly appreciated. Thanks!
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 . The comp test isnt a good one for judging when to change a piston.A better bet is to log the number of hours on the piston/ring.A hard rider should look at changing the ring every 5 hours-this is because the YZ has a very large exhaust port and can go through rings quicker than the other brands with smaller ports.A slower rider could extend this to maybe 12hours but i . Picked up an 02 yz125 and the first thing I did was a compression test, which came up pretty low at 90psi. Bike was supposed to have a new top end with less than 1/hr on it. Anyways. 2022 YZ 125 Introduction. By Matt Mattoon and Jimmy Lewis. Photos By Trevor Hunter . This is the biggest revision the YZ125 has seen since 2005 and the introduction of the aluminum frame. Yamaha has been making a YZ125 since— well, likely before you were born. In your history, 2005 was the last major revision with an aluminum frame.
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 the 2022 Yamaha YZ125 have changed, except the fact that it’s the best-handling dirt bike in the world. 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.
KAYABA SSS SHOCK SETTINGS For hardcore racing, we ran this setup on the 2019 Yamaha YZ125 (stock clickers are in parentheses): Spring rate: 4.7 kg/mm Race sag: 100mm (105mm) Hi-compression: 1-1/2 .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 .
Well I just purchased a compression test kit just for checking the top end at different meter hours. We have two bikes and one is about 20 hours ahead of the other one. I just need to see what the compression needs to be on the 2015-2016 bikes. I look forward to running the compression tests and see what the results are. 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 . General Specifications For Your 1997-2001 Yamaha YZ125: Recommended Lubricants And Fuel, Fuel/Oil Premix Ratio, Transmission Oil Capacity, Spark Plug.
This test of the 2001 Yamaha YZ250 is from the December 2000 issue of MXA. Q: IS THE 2001 YAMAHA YZ250 ENGINE FAST? . Spring rate: 4.8 kg/mm Race sag: 101mm Hi-compression: 1 1/4 turns (1 stock .
YZ125 compression testing.
So when Yamaha wanted to hog a chunk of the limelight, it did so by unleashing the first test bike for 2004--the YZ125. With the onslaught of new 250cc four-strokes entering the market for '04 . 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. The 250F is the most stable machine in the 125 class, and it feels like its tires are somehow magnetic. The bike feels very planted at both ends and puts an end to the term “Yamahop.” And the high-low compression clickers let you tune the ride for every track, condition and riding style.Yamaha YZ 125 Cross / motocross Yamaha 2002 87.5 kg (192.9 pounds) Single cylinder, two-stroke Yamaha YZ 125 Yamaha YZ 125 80/100-21 51M 100/90-19 57M Yamaha YZ 125 Single disc 250 mm (9.8 inches) . Compression Ratio: 8.7:1 : Number of valves per cylinder - Camshaft Valvetrain Configuration -
You have to add crankcase compression to the compression ratio of the cylinder. I'm 99% positive it's in the factory manual for Yamaha 2-strokes. I'll look it up when I get home tonight. The other places to go get a general compression spec for 2-strokes is either Eric Gorr's work or SBR Rick's MacDizzy 2-stroke site.
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 . 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 . The CR125 has been at the top of its class in the handling department since the 3rd generation chassis came out in 2002. That bike handles extremely well with comfort. The 2002 and newer YZ125 are not far behind though, so don’t let that be the determining factor. . That means you can adjust the compression and rebound externally with a .
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 . When doing the compression test & you're flailing on the kickstarter (or gently depressing the happy button ), the ignition system is still producing all of the voltage nessasary to create a spark. This voltage would like somewhere to go & if it can't jump a gap outside it may try to find somewhere inside to do this. 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’ve owned several YZ125’s over the years, and there’s a lot of upgrades available for this motocross bike, but they don’t all have the same . 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.
YZ125 Low Compression
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2002 yz125 compression test|YZ125 Low Compression