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Yamaha MX & Off-Road Dirt Bikes
1999 YZ125 breaking down at high rev's
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[QUOTE="dirt bike dave, post: 1428549, member: 18302"] I think the decision is do you try one size smaller or two sizes smaller on the main for the first test run. Seeing as the cylinder and crank are new, I can understand being cautious. Back to back testing is going to help the most Get the next two sizes down on the main, and whatever you need to change them at the test site. Get it up to temp and test with the stock jets. Drop to the next size down and repeat. Listen/feel for any signs of too lean. If none, drop to the 2nd size down. My guess is you will notice an improvment. If not, time to look for other issues besides jetting. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
1999 YZ125 breaking down at high rev's
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