ok i have a 2003 xr50 with two bros trriple clamp kit, two bros old classic 50 pipe, white bros rev box and back spring, but i have stock air cleaner and sum %!ยค spectro oil. but now my problem is my idle is fine but after i run the bike for a little while it gets real hot in the front of the head and sumtimes makes a low scraping nise like a piston. i was wondering if its not gettin enough oxygen to the motor or crappy oil maybe sumthin else someone please let me know what u think! thanks dloc