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Old 12-24-2007, 04:36 PM   #11
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Always adjust your high speed needle first. This is th overall fuel flow to carb. Get it running and warmed up. Tune the engine with a half a tank of fuel because it will always run richer when full and leans as it goes down so get it right for the lower end, it's always good to start richer.

do some high speed passes and set the top end mixture. lean for top speed and when you get that right richen it a tad. then go about setting the low speed needle. every change you make to the high affects the low.

couple ways to set the low. after running around pull in idling, and count to 5 then take off... there should be some slight hesitation from fuel loading up then it should move out. or you can pinch the fuel line. run around driving then pull in and pinch the fuel line in front of the carb to stll the vehicle. the engine should go up in revs then die out. if it dies right away it is too lean and if it runs on forever and idle goes way up, it is too rich

temp guns are good to get an idea, but really tuning by ear and how the motor reacts is something to learn. after you get it setup like this check the temp

if you don't have a temp gun, put a gob of spit on the engine head. it should look like cooking pancake batter. the spit should have bubbles coming through it. if it just sits there, it is too cold, and if it bounces around or evaporates, it's too hot
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