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Hmmm, he states the connecting rods are shorter on the Z2. I was expecting them to be longer. Not the first time I've been wrong.

I was checking the sizes of the 903,1015 pistons cast and billet against the 750 piston. I just came up with more questions. I applied to the Z2 site, we'll see if I'm accepted. Maybe then I can get info from some of their members. I'll post pics of the pistons and my measurements with my caliper later today.
Steve

A coat hanger, or any straight piece of wire can answer the question. Pull the spark plug, put the piston at BDC, measure how far the wire comes up the plug hole for the piston to reach TDC. I would think the 903 Z1 could have been made into the 750 Z2 CHEAPEST by pushing out the 903 sleeves from their cylinder block, pressing smaller bore/thicker wall sleeves with the desired bore for the 750, changing the pistons, crank, and rods.

Should take about two minutes to end this argument.


I have a Ford 352 (FE series engine) that is the same as the famous 390 other than rotating assembly. Ford didn't mark the engines well, so the easiest way to know what you (should) have when you deal with the FE is to measure the stroke.

No arguement. I have a 903 piston and two different Wiseco 10.25/1 70mm pistons. I've measured them and will put up the comparisons to the 750 soon. The blocks are the same. It appears The pistons and crank are different. I'm in no hurry.
Steve

Below is a stock KL250 piston (with rings) and a Wiseco 1075cc 72mm piston. With a standard 17mm pin pushed through both pistons, you can see the Wiseco is about .025"-.035" taller then the KL250,
That means it will go into the combustion chamber further and it not be at flat deck height in a stock block.
Not sure what that means or how it connects with what your talking about ... but there you go...

My camera won't work without full batteries. I'll put up pics as soon as I cam. We're talking about 8mm here.
Steve

Yikes, that is 5/16".....

Now that's about as low in the cylinder the stock 1015 pistons are. Not 8mm.
Steve

hows that z2 crank doing in your 892 cc motor?

i am still trying to piece this engine combo out .when you have a short stroke low compression motor how can it make the same horse power? and the jetting has to be different.i wish i knew the answer.

Two foregoing posts moved from Carburetor forum.

Good Fortune!

No eBay APP ID and/or Cert ID defined in Kunena configurationWon't be long now. I just ordered my piston and base gasket. Still need a one piece copper head gasket. One thing at a time.
Steve