Hi everyone
I have a model 35 Vanguard, a Performance V Twins short block with stock heads, shimmed springs, ARC flywheel and 2 bbl carb on gas. If I run hard, when I shut it down it makes a rattle sound and a puff of smoke out the carb, it will do this once every 5 -6 races.
It all started when my bumper got pushed into my rear tire and finished the race not realizing it was working harder than usual. I have checked the usual, flywheel key, valves, compression.
Any ideas what is happening?