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Everything Dirt Bike
Make / Model Specific
Yamaha
Why Won't My 2007 Yz250f Start?
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<blockquote data-quote="AKmotorider" data-source="post: 111721" data-attributes="member: 1118"><p>Alright guys, I have an update! On a 2007 YZ250F the intake valve clearance is between 0.10 and 0.15 mm. The exhaust is 0.17 - 0.22. I measured mine and it came up as exhaust taking no more than 0.06 and the intake wouldnt even take the smallest, 0.02, feeler available. That means the side of cam lobe and the valve bucket is probably touching...not a good thing I'm guessing. That is quite obviously off spec...so what size shim do I need?</p><p> </p><p>Also wanted to mention that when trying to get it to TDC I had some issues. When the two dots on the camshafts were lined up perfectly, the mark in the timing cover down near the crankcase would be off by about 1-2mm . Align the mark, and the dots on the cams were slightly eskew. My instructor said it is too small of a difference to matter, but then again, he works on cars, not finnicky high performance motorcycles. Maybe this is why it is backfiring? Also, which one matters more when checking the valves? Aligning the cam dots or the timing mark? Thanks.</p></blockquote><p></p>
[QUOTE="AKmotorider, post: 111721, member: 1118"] Alright guys, I have an update! On a 2007 YZ250F the intake valve clearance is between 0.10 and 0.15 mm. The exhaust is 0.17 - 0.22. I measured mine and it came up as exhaust taking no more than 0.06 and the intake wouldnt even take the smallest, 0.02, feeler available. That means the side of cam lobe and the valve bucket is probably touching...not a good thing I'm guessing. That is quite obviously off spec...so what size shim do I need? Also wanted to mention that when trying to get it to TDC I had some issues. When the two dots on the camshafts were lined up perfectly, the mark in the timing cover down near the crankcase would be off by about 1-2mm . Align the mark, and the dots on the cams were slightly eskew. My instructor said it is too small of a difference to matter, but then again, he works on cars, not finnicky high performance motorcycles. Maybe this is why it is backfiring? Also, which one matters more when checking the valves? Aligning the cam dots or the timing mark? Thanks. [/QUOTE]
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Everything Dirt Bike
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Yamaha
Why Won't My 2007 Yz250f Start?
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