07 Polaris Outlaw 90, Timing issue

[Sha35297]

So, I got this 07' Polaris Outlaw 90 in the shop to rebuild top end and transmission. Replaced all bearings and gears in the transmission. Replaced cylinder and piston with brand new parts. Put the engine back on the frame and fired it up. Started great, but had a taping sound in the lower crank case. pulled the flywheel cover off and found the flywheel was wobbling and hitting the stator. I then replaced the stator and flywheel with brand new parts. Timing is all set on the timing marks now, but when I turn it over it kicks back when it fires and ends up stripping the starter idler gear. I've replaced the starter gear once already and now have to replace it again. Is it possible that the timing marks on the flywheel are off or maybe this flywheel is not for this exact model? Thinking of advancing the timing to try it, but don't want to keep going through idler gears.

[Sha35297]

I have now gone through 4 starter idler gears on this bike. I've checked and rechecked timing marks. Nothing seems to explain what is happening. I read somewhere that the temp sensor is bad and causing the timing of the spark to be off and backfire. However, I have not been able to locate any kind of temp sensor on this particular bike, and I see no way to adjust the timing of the spark. Anyone come across this before? I cant keep going through these gears for $30 each.