I am having a problem with the tune on my bike. I am getting backfiring on decel at all speeds and rpms. I roll on the throttle, let up and POW! It has been happening since I installed the Big Radius 2 into 1 and ran the map from Fuel Moto to my PCV.

I called them and Keith was very cool suggesting I add fuel to the 0 throttle position from 1750rpm and up. So I began, 20, 25, 35.....on up to 50. This is as far as Keith said to go. What else could be wrong here? Does my bike need to be tuned? It is not sporadic popping, happens all the time.

2010 Dyna Wide Glide
PCV
Stage I K&N Air Cleaner
Vance and Hines Big Radius 2 into 1
O2 sensors disabled

I am thinking either I keep messing with the map or throw my stock air cleaner back on, hook up the o2 sensors, take the PCV out and just run the pipe. Any help or suggestions would be GREATLY appreciated. Thanks all....

 

Leak at exhaust gasket in the heads. Which gaskets did you use?

 

I have the screamin eagle gaskets on there, had to remove the stock gaskets cuz the pipe wouldn't fit. What do you suggest? Is there another type of gasket I can try?

 

Stock tapered gasket seal the best. You may have to use two SE gasket per port.

The twin cam head is larger than the EVO head, but the TC uses the EVO exhaust configuration. To get it to fit the TC the counter bore for the gasket is deeper and the exhaust flange will bottom out on the head before the gasket is crushed.

I had the same backfire problem because I used the SE gaskets. Stock gaskets cured the problem. Some after market exhaust for TC come with a SE type gasket, but it is thicker. I don't remember the which exhaust it is or who makes a thicker gasket.

 

It's your pipes.

 

If backfireing thru the intake it is lean.
Out the exhause it is rich.

I had a VH big Radious and it needs the SE Gaskets.
The pipes are 1 7/8 inlets. Using the stock type gasket will choke the opening.

And I have used two gaskets each side and another set of pipes before.

 

It is backfiring out the exhaust....Yeah I figured the oem gaskets wouldnt work because of the diameter of the pipe heads. I guess I will try two gaskets to see if that is the problem.

Also, funny you should say that because when I was adding fuel to the 0 throttle position, it seemed to get worse...I guess it was too rich???