I have an 89 suzuki rm80 and i just got it back out of the shop because of the expenses but it needed a new cylinder head, 2 pin,crank..?? not sure what that is,a new crank, and a new piston.. so I bought a freshly bored cylinder, brand new piston and rings and gaskets, the crank had a little bit of play in it but it seemed fine..so I put it all back together and it fired up in two kicks, I rode it arond for about ten minutes and it cut off so i took off the top end and the spark plug was fouled out by antifreeze and inside the cylinder head smelled like antifreeze so i wiped it all out and got a fresh spark plug and it fired right up again, but the same thing happened..I need to know why and how the coolant is fouling the plug? some one please help its frustrating