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Revo Speeds up

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A

AKRevo8300

RC Newbie
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Hi I just bought a used Revo, it runs fine the only problem I can't seem to figure out is that it seems to speed up by itself. If I don't add throttle or anything it seems to pick up seed. This is my first truck with a trans so maybe I am missing something. Wondering if anyone can help point me in the right direction to my problem...
 
Or could be a throttle/trim to receiver/servo issue. Lean on the upper end, back out on the high speed needle a bit. Check high speed needle setting, count the number of turns to close needle by turn clock wise. Factory setting is 4 turns out counter clockwise. Used for break ins so it a little rich. Check how much smoke is coming out of the pipe? No smoke at all, to lean. Looks like a crop duster to rich.
 

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