Having problems with my bike.

[GG221]

2018 300 XC

I am having the following problems, not sure if they?re all related or separate issues, but started happening about the same time.

-bike is overheating very easily. I have changed head o-rings, T-stat bypass hose kit, 2.0 bar radiator cap, and I can see that the pump is working by looking in the top of the radiator. Still overheating.

-rattling noise in motor. It sounds like a jar of bolts is rattling around inside my motor, very loud and happens at idle and while riding. Something is loose somewhere? Hard to pinpoint where it?s coming from. Almost sounds like power valve but extremely loud.

-bike is bogging down when opening the throttle. Like it is sucking air somewhere. This may be a separate issue as it just started happening. I noticed it was doing it occasionally two ride ago in cold temps at open throttle. I changed jetting, one up on main and it was worse. Went back to original main and changed to one clip richer on needle and still worse. Went back to original jetting and now it is still doing it and it?s getting worse as time goes on. Keep in mind the jetting that I am at now is what I?ve been using for a long time throughout many temp ranges and it has been flawless. Getting a very severe bog at 1/3 throttle opening while riding.

I am going to start tearing everything apart. Ideas?