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Dirt Bike Brands - Other
Bk Mod Duration Timing
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[QUOTE="yota, post: 211889, member: 25192"] forget the stopwatch. just try timing 1/3 second with a stopwatch. what you need to do is push down on the top of the accelerator pump rod on the rt side of the carb until you just feel it contact the diaphram. run the screw you tapped in up to hold it in this position and then back the screw off 2 1/4 turns (fine thread screw). now go to the screw up above the new screw on the same side of the carb. this times when the squirt of fuel from the pump starts. hold the throttle wide open and set the gap between the screw and the black plastic cam to .6mm. the last step is to set the idle properly. most people set it too low cause when properly set it sounds like it is idling too fast. set it to where it sounds too fast and then back it off just a bit. this really helps starting. do these 3 things and your 250f (what I have) or 426 will start easier, have awesome quick throttle response and get way better gas mileage. keep in mind that some of these carbs are spraying gas for up to 4 seconds every time the throttle is turned (mine was 2 sec.). thats a lot of difference from 1/3 second. you may need to richen your needle position after this cause a lot less gas will be going into the engine. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Bk Mod Duration Timing
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