HI! I had a stock xt660r-04 that i have recently installed a OTR 2in1 Exhaust with a GPR race slipon silencer on, without db-killer fitted (almost straight through).

When I testride it for the first time after I fitted the new exhaust, it run very poorly.
when accelerating with about 40% throttle or more it cuts off for about 1 second and then goes back on again, It is worse and does so more easily on lower gears. The bike also got harder and harder to start.

My first thoughts was that it was running lean, but I removed the airbox cover just to see if i't would run better and I noticed that it got easier to start.
So I order a Powercommander 5, k&n standard filter, DNA stage 2 airbox cover filter and I have also removed the snorkel.
I asked OTR for a fitting map to my setup, and i got a map for the DNA stage 2 filter and OTR 2in1 exhaust with a akrapovic silencer on (road legal).
But even with this map it runs the same if not even worse. I have also tried other maps that I have found on this forum but all have the same problem.

Another thing I have noticed is that when my bike is idleling and set to neutral and I put it on the sidestand, the engine dies and I can't start it,
but when I turn off and on the ignition and have the bike upright, I can start it again. And the bike can't be started when it is on it sidestand,
but the startermotor i still turning.

Any kind of advice or thoughts are very welcome!

Best Regards
Emil