piston rings

I have 1980 KZ750 four cyclinder.....now the engine says 750ee so I'm wondering what rings I need and if any one has a good place or website to buy them....One more thing says set on lot of them does it mean for two pistons or Individual if someone has ordered them before...thanks for your time

Get up on www.kawasaki.com and check the exact model number and year of your motorcycle for the correct part number...Kawasaki used different rings in different 750 models. At this time, the rings are still available from Kawasaki but are in limited numbers...you'll be buying a set for each piston. As they are still available form Kawasaki, any Kawasaki dealership will order them for you.

At the bottom of your engine block on the left side (if your sitting on the bike) there should be a molding stamp that tells you the liters of the bike. For instance on one of my KZ's it says 0.999L. This tells me exactly what size the engine is. It should give you a very good idea of what size rings you need based on what engine that block belongs to.

Your best way is of course to pull your head and use some calipers on your cylinder wall to be exactly sure. For instance on the '82 KZ I have, it measures 73mm on the cylinder wall so I know I need 73mm rings.

Besides if you bought your bike used, there's always a chance the rings are no longer stock size. The block could have been bored. Best to check if you can do without the bike while you wait for the rings to come in.

Don't forget to hone!

Well kz750 four has 66mm piston. From 1980 and 1981 bikes use piston rings part# 13008-5031 and piston 13001-1059 std size.

1982 and up kz750s uses new piston and thinner rings 1.0-1.2-2.8mm

Another thing is I took block apart and rings look okay and gap in the cyclinder was within spec when I put it inch down I just had low commpression and I found I needed a valve job....only thing is I don't wanna buy them didn't need to or not buy them I needed them reason why I have buy gasket kit and don't wanna have to replace gaskets if I still have low commpression I was at 90 psi in all cylinders but valve were leaking with no camshafts

If you're already in there getting a valve job done (which it sounds like you are) I'd replace those rings and hone too. It's not very expensive and might as well if you've already broken it down. Assuming it wasn't done recently.