[rideon4]

I have the full HMF pipe with CB, and lid off. It did improve the power over the stock pipe and header by a few HPs. I do run it a lot with the quiet insert to keep the noise down around my private riding area, or when I don't really need every ounce of power.

I have had some issues with backfiring more than I think it should. It happens after I let off the throttle. It just happens a lot.

I also have discoloring on the header more than half way to the pipe. I know to the first bend is normal, but again, it is going too far for what I know.

Can any of you give me a basic idea as to where I might look into for getting it right? I do use the stock airfilter and I am in Chicago, so altitude is not the issue.

I don't know if I am lean, rich...I am no mechanic.

Thanks as always for your help.

Tom

 

[BCGIrish]

1. Any smoke when it back fires?
2. Does it do it cool in the garage when you mash the throttle then let offor only after it's been running awhile?
3. Have you tried putting the airbox lid back on?

 

[kidsdad0101]

Discoloration is gunna happen to all pipes to varing degrees. Should really show about half way up head pipe. Will taper off after that. However, i wouldn't worry about the discoloration to much. Its gunna happen. As for the back fire, this is a fuel/air issue. As stated above try adding lid back on 1st. Do is back fire when you give or release gas? Any smoke...color? 1 pop or many in succession? What EFI you running?

 

[rideon4]

I will ad the lid on my next ride.

I am not getting smoke or anything like that. Just a bit more popping after letting off, than usually noticed.

I'll know more after this Saturday.

Thanks

 

[Zookie183]

Sounds like it's lean popping to me? Did you make any modifications to the airbox (cut holes)? If the lid back on does help (which will rob you of horsepower) I would recommend some shop or someone adjusting your air/fuel mixture using a programmer.