i just got a new crank and top end put in my cr 125 and it has fouled 2 spark plugs in 4 hours of riding. am i mixing the fuel wrong, i mixed it at around 32:1 it idles fine and im still in the break in process but all the power is there. i am running a NGK R B8 spark plug a buddy of mine told me to go the 7 so itll run hotter but idk the factor put a 9 in it to start wiht that and that fouled really fast. any help would be appreciated.