Please help! Can't find the right piston!!

[aaron7]

1973 Kawasaki F11. I need a piston and rings... really bad! I bought a .50 (stamped on top) piston (NOS Kawasaki 13029-055) from ebay, but when I got it, it was the same size as the piston I took out, which has 1.0 stamped on it. Both mic to .68, which is the stock bore! The cylinder also mics to .68. So why does the stock piston measure the same as the overbore one? Could it be a factory stamping error?

I found a Wiseco piston on ebay, part number 153-P6, but that is .60 over and that is quite a bore...

Then there is this:

http://cgi.ebay.com/ebaymotors/KAWAS...QQcmdZViewItem

When I talked to the guy selling them, he said that they are NOS in the boxes, and the boxes say .40 over, but the pistons are stamped 1.0 on top. 1.0 is standard bore, right?

Boy am I lost!

[ak4dd]

www.ariaspistons.com
has about everything!!!!!!
good luck

[aaron7]

Ok, checked out that link, but no F11. I contacted them via phone, and they said it would be a custom one.

I ordered the .60 Wiseco piston. But, they say it measures 69.xmm... so I'm wondering if it's .60 over metric, which would be what, .30 over standard? Regardless, my current cylinder measures 68mm, so this should work.