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February 6, 2019
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See all updates by HSKzz
URGENT! I am currently trying to break in my AR-21 engine, 20% fuel, throttle all way closed and air filter on etc etc. Except it keeps revving up on it's own with out the throttle moving a hairs width? Any ideas?
froggy8
what is the gap like on the carb? if that is around 1-2 mm then i would thought the lsn is on the lean side so try richen that out
also i have always used 25% on all my 21 engines