decel backfire

[vet14tango]

When I get heavy on the throttle and let off I get a loud gunshot backfire. Any ideas? Recently had the 200 mile service done and it started after that. Valves maybe?

 

[b_700x]

Could be the valves..

 

[aces3]

What year? My 08 has pretty much done that from the day I bought it but not a real loud backfire but loud enough.

 

[vet14tango]

Its an 09. It didn't start until after the valves were adjusted. Also after the valve adjustment I have some power loss. Not a bunch but I can tell its not as powerful as it was before. Before about 53mph was pretty easy and after I have to get her wound out pretty far to attain 50mph. Any ideas school me up folks.

 

[b_700x]

Do you know everything that they did during the service?

 

[aces3]

Yeah I would check with your dealer and let me know i HAVE NEVER GOTTEN MINE OVER 50.(CAPS)

 

[REVREND]

I was starting to loose top end speed. Once I changed my belt, I got my top speed back again. How many miles are on your belt?

I'm running an EPI clutch kit and I think it stretched my belt and wore it out a little quicker than a stock set up would have. I changed mine around 5500KM's (3400miles). When I changed it, it was still within the factory specs. ...but it was enough to slow me down.

 

[aces3]

What does the belt have any thing to do with the backfiring? I have 1400 miles on my wolvy and the belt still looks brandnew.

 

[kevin468]

My 06 450 was doing the same thing. It seem to be worst on hot days. I jetted my bike and put a hmf pipe on and it has not done it since. I think it's lean. Try jetting it. It worked on mine.

 

[Glenn]

It seems that most machines are a bit "lean" from the factory these days to meet EPA regs. I'm betting that going up one size on the main would probably eliminate the backfiring.

 

[AnotherNewb]

running lean test

If you think your running lean, give it a little choke and see if it fixes it. If so your running lean, if not, then something else is wrong.