"Right. I realized my comment applies to the 73-80 engine. Is you're starting with a J engine you don't need the spacer.
Regarding 17mm vs 18mm wrist pins, these pistons seems like they are intended to be used with either 17 or 18mm pins.
"WRIST PIN SIZE: 17MM (CAN BE HONED TO 18MM)"
www.mtceng.com/pistons/kawasaki/gpz1100/"
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My engine is a 81 GPZ1100, so it has the 17mm wrist pins. Here's where things get a little fuzzy for me on the specifics. From what I understand from researching:
Because they are 17mm and the later model engines are 18mm, there is a .5mm delta some where. If all they did was increase the hole size why would anything change length wise?
Somebody smarter than me needs to clarify. Is the rod the same length between the early and later engines? if the rods are longer on the earlier models then you would want to shim the base of the cylinders so that there would not be any interference. I'm just guessing here....
577nitro.