I have a 1997 banshee that starts overheating after a 15 minute ride. it also bogs at low end and sputters a bit at top end. it starts dropping coolant from the overflow hose near the radiator, the compression on the bike last time i checked was about 120psi on one cylinder and 115psi on the other, it has a 4mill crank with original cylinders and a mild port and the stock head has been shaved. some people have told me that it overheats because of the low compression, and i don.t know whether to put a new top end or maybe the head was shaved a bit much that it lowered the compression that much, i bought this bike as is like 2 months ago any information would really be appreciated thanks.