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Everything Dirt Bike
General Dirt Bike
Problem. Help!
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<blockquote data-quote="ossagp" data-source="post: 170209" data-attributes="member: 1650"><p>The first thing i suspect anytime someone tears one down that ran previously is they they have the cam timing off. If it was off far enough you may now have a bent valve. </p><p></p><p>The quick check is that you get maximum valve clearance when the flywheel rotor is set at the mark indicating top dead center. Usually that is a "T". If you have no clearance, turn it over 360 degrees and check again, as tdc on the exhaust stroke will show the same timing mark as the compression stroke on a 4 stroke.</p><p></p><p>Assuming you already checked that motorcycle is indeed making spark at the plug and fuel is reaching the carburetor.</p></blockquote><p></p>
[QUOTE="ossagp, post: 170209, member: 1650"] The first thing i suspect anytime someone tears one down that ran previously is they they have the cam timing off. If it was off far enough you may now have a bent valve. The quick check is that you get maximum valve clearance when the flywheel rotor is set at the mark indicating top dead center. Usually that is a "T". If you have no clearance, turn it over 360 degrees and check again, as tdc on the exhaust stroke will show the same timing mark as the compression stroke on a 4 stroke. Assuming you already checked that motorcycle is indeed making spark at the plug and fuel is reaching the carburetor. [/QUOTE]
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