Thread: Jetting 101
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Old 16-06-2007
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Keg Keg is offline
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Location: 2 Stroke Town
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WHY DO WE USE CHOKE?
Only vapour ignites, not liquid petrol. When the motor is hot it evaporates quickly, but first thing in the morning it is cold and the fuel condenses on the head and barrel. So by pulling out the choke, it richens the mixture up to compensate for all the fuel that stays as a liquid.

When your bike starts the motor heats up and makes the fuel vapourise quicker. Often it will blow a bit of smoke, this is the unburnt fuel mixed.

WHY DOES MY BIKE STALL WHEN I TOUCH THE THROTTLE JUST AFTER I START THE BIKE?

Like with a flooded bike, when you turn the throttle you lift the slide up and actually lean the air/fuel ratio out. If you bike is not warm enough and vapourizes the fuel correctly it will stall. You may need to richen the fuel/air screw up a bit during winter to help starting.
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Last edited by Keg; 16-06-2007 at 11:15 AM.
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