Mine will do that if I let it sit and idle for to long
with out any air passing the pipes to cool them..

But it wouldn't hurt to check if it's not running to lean...
I set my kevs mod at about 6 O'clock any less that that
I can notice the engine temp rising...



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__________________
Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...