CFMOTO 650 aka Hartford Diablo

Check out my video of the exhaust swap

https://youtu.be/90bs1jHugbA

When I fitted a Scorpion Red power muffler on my 650mk I also experienced LOUD ! backfires as well , turned out to be a bad seal where the muffler fitted to the headers , cold air ( oxygen ) getting sucked in and igniting indide the muffler .
I went to an auto shop and grabbed the 3M exhaust bandage and sealed it up , this stopped 99% of these .

After I finished making the racebox system for the 650nk I have zero backfiring because I cut the standard pipe off the CAT that mates to the header and welded this onto the new racebox muffler , the standard joint has a carbon gasket that ensures a perfect seal and hence no backfiring .

Nope this helps and yes these sound awesome don't they and here is a few photos .
I have since fitted the Scorpion to my missus;s Honda VFR250 , sounds like a Ducati now , nice .

Briann

Cant seem to add more than one photo at a time ? , anyway here is the finished racebox muffler and pipe .
Brian.

And the Scorpion redpower on the VRF250 .
Brian.