my 2002 yamaha yz426f broke a valve and need to know what i need to replace first. the head is apart now. i going to atempt to do the the repairs myself. i bought crank spliter, crank instaler, pistin pin puller, flywheel puller, and clutch/flywheel holder tools. do i need anything else. they said at the dealer i proboly should replace the crank rod. do you think i need to buy a new cyilinder.