I am looking for some help with my RZR 900XP. I have made the following modifications, 975 big bore kit from team alba, 12.5:1 pistons, stage 2 cam from team alba, Carrillo rods, Dragon fire dual exhaust, Dobec Gen 4 controller.
Controller settings:
idle light cruise set to as rich as the controller allows, shows 16+ lean when at idle
Cruising 13.5
full throttle 12.5
Acceleration 11.5

It also has a clutch kit from team alba
Problem the exhaust glows red after a little driving, backfires out the exhaust at low speed
Does not return to idle after hard acceleration, wants to stay at 3500 rpm until the brakes are hit.
It would seem to be running very lean but the AFR gauge shows the setpoints put in when in closed loop, cruising and full throttle.
Any suggestions to help me figure this out would be appreciated.