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Everything Dirt Bike
Make / Model Specific
Yamaha
1988 yz250 build
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<blockquote data-quote="Mihylo33" data-source="post: 197272" data-attributes="member: 408"><p>Only replace the gasket if it's torn or mangled. No sealant needs to be on the boot at all. </p><p></p><p>My bet is the magneto side crank seal. With the cover off and the bike running spray some wd40 behind the magneto and see if the Rpms change. If it does. Replace that seal. However with an air leak this shouldn't be at max Rpms. More of a very high idle like a car with the choke still on.</p></blockquote><p></p>
[QUOTE="Mihylo33, post: 197272, member: 408"] Only replace the gasket if it's torn or mangled. No sealant needs to be on the boot at all. My bet is the magneto side crank seal. With the cover off and the bike running spray some wd40 behind the magneto and see if the Rpms change. If it does. Replace that seal. However with an air leak this shouldn't be at max Rpms. More of a very high idle like a car with the choke still on. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1988 yz250 build
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