backfire

kingcole · Aug 5, 2016

Rebuilt my 1972 750 after 30 years off the road and is running sweet as a nut after a 250 mile try out, the tickover has not changed much but on switch off it gives a backfire at the ehhaust and a popping through the carb, have checked valve clearance and plug gaps and the Pazon ignition is still in line. I am worried that the popping through the carb could cause it to catch fire. Any suggestions lads ??

maylar · Aug 5, 2016

Does it pop when you turn the key on & off, or only when shutting down while running?

kingcole · Aug 5, 2016

thanks for the reply Maylar, It only pops after I switch off..

Triton Thrasher · Aug 5, 2016

...............

Danno · Aug 5, 2016

Sounds like the "wasted spark" is igniting some excess fuel. Drop the float levels a bit.

Onder · Aug 5, 2016

Whilst you are in the carbs, make certain the jets and holders are nipped up.

Triton Thrasher · Aug 5, 2016

I don't think there's a problem at all.

gripper · Aug 6, 2016

I know that Boyer ignitions spark when being switched off.

backfire

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