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Everything Dirt Bike
Make / Model Specific
Yamaha
The 1999 YZ250
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<blockquote data-quote="Trfsrfr" data-source="post: 216688" data-attributes="member: 3959"><p>Did the compression test - 216psi.</p><p>Dropped the float to 7.5 like I said, and ran it for about 10 minutes. Sounded decent enough I guess for just blipping it on a stand.</p><p>Adjusting the air screw didn't seem to have much affect and it ran all the way in. </p><p>I'm at stock jetting and clip position. Spark plug looked dry, not sure what color but darkish.</p><p></p><p>Took the stethoscope to it and the noise seems to be more in the upper end, and maybe near the PV, but it's hard to be sure. It does sound like it gets further away the further down toward the bottom of the engine I get.</p><p>But that might just be wishful thinking. </p><p>I replaced a front wheel bearing in my car once, only to have it be the other side that was bad. I could've sworn it was coming from the one side though.</p><p>I'll take apart the PV next.</p></blockquote><p></p>
[QUOTE="Trfsrfr, post: 216688, member: 3959"] Did the compression test - 216psi. Dropped the float to 7.5 like I said, and ran it for about 10 minutes. Sounded decent enough I guess for just blipping it on a stand. Adjusting the air screw didn't seem to have much affect and it ran all the way in. I'm at stock jetting and clip position. Spark plug looked dry, not sure what color but darkish. Took the stethoscope to it and the noise seems to be more in the upper end, and maybe near the PV, but it's hard to be sure. It does sound like it gets further away the further down toward the bottom of the engine I get. But that might just be wishful thinking. I replaced a front wheel bearing in my car once, only to have it be the other side that was bad. I could've sworn it was coming from the one side though. I'll take apart the PV next. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
The 1999 YZ250
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