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Everything Dirt Bike
Make / Model Specific
Yamaha
yz125 help
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<blockquote data-quote="ossagp" data-source="post: 187737" data-attributes="member: 1650"><p>the weak spot with yamaha and their manual for setting carburetors, the float in particular is how they state "ranges". people read that and think they can have a range of say 2.3 mm and that it will yield the same effective jetting no matter where in that range the level falls. not the case. It is also the strong spot to others. Yamaha does a real service to a person who is trying to actually "tune" the engine. That is a range that the carburetor can function properly in, ie not flood and not be so low when the bike is on level ground that it is likely to start sucking air into the jets instead of fuel. that leaves the owner or tuner etc to pick the part of the range he wants to maintain or jet for, and to know what range he can use to affect an across the board change in. The smart ones have specific jetting for temps and altitudes that go with each segment of that range in most cases.</p></blockquote><p></p>
[QUOTE="ossagp, post: 187737, member: 1650"] the weak spot with yamaha and their manual for setting carburetors, the float in particular is how they state "ranges". people read that and think they can have a range of say 2.3 mm and that it will yield the same effective jetting no matter where in that range the level falls. not the case. It is also the strong spot to others. Yamaha does a real service to a person who is trying to actually "tune" the engine. That is a range that the carburetor can function properly in, ie not flood and not be so low when the bike is on level ground that it is likely to start sucking air into the jets instead of fuel. that leaves the owner or tuner etc to pick the part of the range he wants to maintain or jet for, and to know what range he can use to affect an across the board change in. The smart ones have specific jetting for temps and altitudes that go with each segment of that range in most cases. [/QUOTE]
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