I have a G2 Yamaha and I really would like to put a 20HP Vanguard motor in. I do have alot of questions, but my main one right now is how the hell the drive clutch comes off!! It is a 4 stroke and I have so far taken the clutch cover off and taken the weight assembly off, but the starter belt pulley is still on. Do I have to buy a special clutch assembly for the Vanguard motor? I assume the starter belt pulley on the G2 is pressed on the crankshaft?