I just installed a HMF full system on my BF750. The recommended adjustments after changing out the jets that it came with was 2-1/2 turns out. After test riding, it was backfiring after I let off of full throttle. So after adjusting more, I ended up at 3-1/2 turns out, with less backfiring, but it is still there. It's running good but still backfiring off full throttle, is this normal or do I need to adjust more?

 

try turning the pilots out some. I think that will help you

 

Backfiring on decel is usually due to a lean condition or an exhaust leak. Popping noise may be experienced after letting off from full throttle, just curious, did HMF have a number for tech support and if so did you call them?

 

I haven't tried HMF yet, and it's like a popping noise on the decel, is that a different sound than backfiring.

 

yes, the popping is more annoying than any thing else. Just make sure your engine is not running to lean as this is damaging. Smell the exhaust and you should be able to determine if it's too lean or too rich. Black inside the muffler will indicate too rich. Also try and check for exhaust leaks as they can cause the popping.

 

Thanks for the info guys. The popping doesn't really annoy me, I just wanted to make sure I wasn't running lean cause I know it could cause damage. I'll try your suggestions. Thanks.

 

check out muzzy's new system 4 the brute force only one i've seen with equel lenght headers look's SWEET

 

If you are still having bad luck call the guys at HMF. They'll help you out. 1-866-HMF-PIPE.

 

With that new HMF full system could you tell much power difference and does it sound
alot better. Also did you change the jetting to the recomendations that HMF put out.

 

Over all it seems to have more power, mostly in the mid range. I'm not sure if I'm jetted just right yet. I did do the recommended jet changes by HMF, but I think the elevation is alot different where they test thier products. One thing I did notice is that I only have to give it about a quarter throttle to get the front end up. As far as sound, I love it. It kind of sounds like a 883 harley without the stumble.[img]i/expressions/face-icon-small-happy.gif[/img]