GPz1100 building -

I'll get you some pics - it looks to me like the surface would have to be built up and line-bored.

Thanks for the response.

BTW - are the chamber volumes much different in your experience, and will my compression nosedive ?

GPzEric wrote: I'll get you some pics - it looks to me like the surface would have to be built up and line-bored.

Thanks for the response.

BTW - are the chamber volumes much different in your experience, and will my compression nosedive ?

It wouldn't worry me. A long time ago I put a set of Web 109 grind in an 85 GPz11. The head got ported and the fuel injection discarded in favor of CRS33 Keihins. The stock pistons were used but the valve pockets were cut deeper for the .425 lift cams. That dropped compression. IT FLEW & THE CUSTOMER LOVED IT...

I've got an extra set of throttle bodies & injectors off a '84, plus the '84 computer, so now I'm thinking run the '84 cams, have the throttle bodies bored, and put on an adjustable fuel pressure regulator, and see how much power this old Kawi will put down to the ground. I doubt the heads will flow as much as the throttle bodies though - they're pretty clean inside.

GPzEric wrote: Well, I guess I'll be the guinea pig, and settle the debate, won't I ?

The '84 valves are sunk just a little deeper in the head, giving them more clearance, and looking at pics of the '84 pistons, they have a dome, just like the Wiseco Pistons, and deeper cutouts for valves, just like the Wiseco pistons.

So I'm going to put it together with the '82 Cams, since they have .8mm less lift than the stock '84 cams, and will help with bottom-end power, and give a little more peace-of-mind as far as clearance.

So I will report back as to how much clearance I have, and how many psi of compression I have.

I didn't start out to build a Frankenmotor, just to preserve a piece of motorcycling history !

:huh: What was the result of your experiment?