Difference between revisions of "Jetting"

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==Main Jet==
==Main Jet==
At 3/4 throttle and higher, the ONLY thing metering fuel is the main jet. If your bike has problems at wide open throttle, the main jet is your culprit (unless it's your ignition...???). A larger main allows more fuel.
At 3/4 throttle and higher, the ONLY thing metering fuel is the main jet. If your bike has problems at  
 
When you modify your bike, i.e. cut your airbox lid, install a high air flow airfilter, you are changing the amount of air into the engine.
When you install an aftermarket exhaust pipe, more air (exhaust) is coming out of your engine.
In BOTH of these conditions, you MUST increase the fuel going to your engine to offset the air going into (or out of) your engine.
 
Moving more air means you have to move more fuel.
 
==Elevation & Weather Changes==
When there is a change in the weather or riding elevation, the amount of Oxygen or moisture will be the culprit. At higher elevations, there is less O2 available. You will need to jet lean to decrease the amount of fuel to compensate for the lower O2.
If it is humid, there is MORE water in the air, you MAY have to jet lean.
In the winter, bikes run lean. Because of the lower temps and humidity, there is more O2 due to density changes. Your bike will run lean, and you will benefit w/ RICHER jetting.




[[Category:Articles]]
[[Category:Articles]]
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