Join Date: Oct 2003
Location: Big Bald Lake, Buckhorn Ontario
Thanked 66 Times in 47 Posts
Sled: ZRT-AGLT 1050
ATV: AG Edition MotoX V2
A friend and I were discussing this last night... The problem is that raw fuel fumes/vapour is being ignited in the pipe when starting up.
When you stop riding, the idle rpms will be a little high until the pipe cools down. After riding, let the engine idle for a few seconds until the rpms drop... Then turn off the motor. It may not prevent the problem, but should minimize it.
When riding, the pipe is hot... Which keeps the piston hot... Which induces a leaner burn condition than when the pipe is cool. This temporary situation is what causes the idle rpms to be higher immediately after riding.
If you shut down the motor immediately after riding while the rpms are high, what happens is the motor is still drawing in fuel but without a spark it is not burning. The raw fuel vapour ends up in the pipe. You start the sled, the fuel vapour in the pipe gets ignited, and there's your big bang.
It is not a backfire, and is not ignition devices failing. Just let the rpms drop before you shut her down hot, and the problem will be minimized or gone.
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