Popping on decel

[Wingboy]

Crashed my track only 944 Ducati hard enough that it needed new exhaust.All the other damage was bodywork and controls.It had a pair of really big Akra's on it before and didn't backfire or pop when downshifting.Now with a pair of Remus cans installed,it pops with every downshift.(only a run up and down my street).It's fuel injected,so i don't think anything could have changed.Could a slightly more restrictive exhaust cause this?Do i need an expensive dyno session now to remap?

[RonnieRev]

Popping on decel is a sigh of a lean fuel mixture, with FI a remap is your only option

[Asspire]

check for exhaust leaks. if all thats changed is the cans then might have a leak somewhere in the system

[coyo]

Popping on decel is a sigh of a lean fuel mixture, with FI a remap is your only option

I thought it was a sign of a rich mixture?

[mxs]

My bike does it all the time. I do know it's jetted a bid lean on the low speed circuit. Fine with me, it's not really harmfull in any way.

[Wingboy]

Took the cans off and sealed them with Permatex copper sealant.Couldn't take it out for a quick one down my street today tho.Saw a few cops around.

[toysareforboys]

Took the cans off and sealed them with Permatex copper sealant.

Where'd you get the Permatex Copper? I want to two canadian tires and both of them only had up to Ultra Black

-Jamie M.

[toysareforboys]

Crashed my track only 944 Ducati hard enough that it needed new exhaust.All the other damage was bodywork and controls.It had a pair of really big Akra's on it before and didn't backfire or pop when downshifting.Now with a pair of Remus cans installed,it pops with every downshift.(only a run up and down my street).It's fuel injected,so i don't think anything could have changed.Could a slightly more restrictive exhaust cause this?Do i need an expensive dyno session now to remap?

With the R6 peeps, when they change the factory exhaust they get LOTS of pop, gurgle and backfire on deceleration! If the bike has a fuel management computer (i.e. power commander) or a reflashed ECU adding extra fuel on the deceleration section seems to help a lot:



http://www.youtube.com/watch?v=FI4djEs1Cws&hd=1

Does your bike have a "smog" system, fresh air injection system, PAIR, AIS, etc.!? Usually plugging that up so it can't suck fresh air (or on the R6 we rip out ALL the smog stuff, hoses, AIS pump, etc. then slap on "smog block off plates") will correct all or almost all of the pop and backfire.

I'm not sure what type of options are available for your Duc, never worked on one

-Jamie M.

[Wingboy]

I didn't put any sealant on the can to header joint.That's worth a try.The bike is a retired racebike with no smog stuff other than the crankcase breather that dumps into the airbox.No p.c. on it.I assume that the ecu can be remapped.I just don't have $400 to spend on dyno time.

[RonnieRev]

If you had a exhaust leak you would hear it on acceleration\under laod

[Wingboy]

If you had a exhaust leak you would hear it on acceleration\under laod

I dunno.There is a lot going on down there,13/1 compression and all.

[invictus43]

I dunno.There is a lot going on down there,13/1 compression and all.

And pistons the size of a Nascar stock car's!!