hi everyone can u help? ok my gearbox is crunching when i change up or down into 2nd gear the gear is also rumbleing i can feel it through the gearstick i dont think its cable or clutch as the rumble is there with clutch engaged .what is most common? im running bb yellow spec what is best clutch to use?also what would be my valve clearance on inlet and exhaust i have 270 cam with highlift springs would they be different from standard? cheers