Mine started running bad last fall during a riding trip. Only when the quad was hot though. It would cut out very badly at anything over half throttle. I posted on here a few times seeing if anyone was having the same issue. I ended up changing my fuel pump, didn’t fix it.

Finally a buddy of mine who has an RZR let me borrow his ignition coil. That fixed it. I ordered a new coil and wire, it has been running great ever since. I know the heat is what caused it. The coil on his RZR is mounted further away from the engine, ours is mounted right on top of it pretty much. I wrapped the coil in some DEI foil/fiberglass heat tape, found at most auto parts stores. We will see how it goes.