Occasional backfire

[bryan_damone]

So I have been out on my 440 invader for the first time since resealing and giving all systems a good inspection during the non-winter of 2012.

After taking it easy until warming up, I would get on the throttle and everything would seam as it should, but sometimes when coming of the throttle suddenly at the end of the yard to make a turn, it would sometimes backfire.

Running stock carbs, jetting, airbox. Exhaust is all intact.

What are your thoughts on this?

[Trucker]

I had that happen once and it was a bad connection to the cdi

[mswyka]

Every time one of our sleds would backfire we had a crank seal issue.

[bryan_damone]

I had that happen once and it was a bad connection to the cdi

This is promising. I just found that the lighting coil connections were loose (lost lights), so it makes sense that I may have other loose connections in that area. I will recheck all connections from stator.