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Help with engine

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Your needle could be just a hair on the rich side. Try leaning it down about 1/16th of a turn (on the low end needle).

Just a little tiny bit is all you need on the adjustment.
 
thanks seems to be running ok now, I'm letting it idle through a full tank. Its cold outside so i also put a sock over the head to git the heat built up. because befor i would touch the header and barely felt any heat
 
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No problem - I've got the HPI F4.1 and it's a beast; that K4.6 ought to be a downright monster... I'm thinkin about getting one when my 4.1 wears out.
 
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