TwoCam wrote:
A couple of things you may want to take into consideration before you "cut" anything.
Milling the head or the cylinder bock will do the same thing, but you need to measure the piston depth @ Top Dead Center to see how much can be removed from the cylinder. You dont want the pistons sticking out of the cylinder at TDC.I'm not talking about the dome of the piston, the flat area above the ring lands. Depending on cylinder head gasket thickness you could have piston to head contact (NOT GOOD)
Also milling the head will retard cam timing , unless you use slotted sprockets and degree the cams back into spec.
Premium fuel will be a must. Remember these engines are air cooled, they get hot.
It's almost standard practice to mill .020" to .030" off the GPz750 head when installing a 810 kit, valves get nowhere near the pistons. The KZ750 head is the same, except for 1cc smaller combustion chambers on some years/models.
A Dremel will slot the cam sprockets, you don't need to enlarge the holes very far (.030 is more than enough).
And I would much rather mill the head than mess with removing the sleeves, especially if they have already been bored.
There are a couple of GPz750 FAQs that go into detail on this subject.
I have not heard of anyone milling the block on the GPz750 motors, seems like everyone mills the head.
Post edited by: steell, at: 2006/08/27 15:23