As I rev up my newly wrecked 2002, and let off from about 6000 rpms, fire and smoke exit the rear. Ideas??? Never saw this on my 2006. More info coming

 

raw gas n a posible exhaust leak.

My D&D does it on ocassion.

 

The fire's coming from the end of my slip on. Really hoping it's not a valve issue. I bought the bike from a guy who laid it down last August. He hasn't ran it since. I just got it running. I've been idleing it every day to keep it running. I rap it to about 6500 onc eor twice, then turn it off. Sounds great, no strange sounds, soudns strong. What da ya think? Common?
G

 

Haha i say let it run a bit more then once. On warmup most bikes will run a bit rich. If the bike is cold its possible. Let it warm up and get to temperature and see if it does it then. If its cold it wont burn off all the gas and air and shoot it out.

Try it see what happens

 

2nd option: If the above doesn't get it, then it sounds like afterfire, which is caused by a lean running condition. If it's doing it and making a sucking sound as you shut the throttle, then you may want to look at the fuel/intake system.

 

Timing or bad exhaust valve?

 

A lean condition will cause this? I was thinking too rich would cause this, hence the excess fuel in the exhuast gasses igniting. regardless, if it still does it after a solid ride, not just idling, I would start looking for leaks in the intake/exhuast.I thinkworst case is a valve stuck open, most likely an exhuast, but I really doubt it would even run smoothly, or at all, if that were the case

 

IIRC Graves' bike were setup like then. You see afterfire on some of them on corner entry. Not the same as exhaust fire post-apex (on the gas hard).