More Squish Questions

[Michael73]

In the Seadoo racing manual I downloaded, it says a stock 97 800 rotax should have between 1.3mm and 1.7mm squish clearance, then later on in the book it says from 1996-98 the squish is 1.4mm.

I have a 2 part question, (Bill half answered one question), will power output be the same is the squish is anywhere between 1.3 and 1.7mm (stock engine, no mods), should you aim for half way squish clearance, or anywhere within the range, or what seadoo says 1.4mm?

Bill said about fuel quality, if you had good fuel, would it matter what the squish was as long as it was within the range? Would the power output be the same anywhere in the squish range (stock engine)? If the power output varys within the squish range, are we talking noticeable difference? 1hp?? 2hp??

And part 2, I dummy assembled (torqued everthing) my 800 engine with a .6mm base gasket (yeah, I ordered a .5 but they sent a .6mm), and the squish was 1.9mm on one cylinder and 1.87mm on the other. To get 1.4mm (what seadoo recomends) squish I have to fit a .1mm base gasket. Will this ultra thin base gasket alter the port timing, and drop power, because the ports will be lower, than if I fit the standard .5mm base gasket? Or alternatively if it dosent matter what the squish is as long as its between 1.3 and 1.7mm, I can use a .4mm base gasket and have a squish of 1.7mm, and not drop the cylinders down as far and not alter the port timing as much?

I tried to fit out what the port timing was meant to be, in degrees of the crank rotating, ie: exhaust port opens at 30degrees atdc, so then I could verify the correct base gasket thickness and squish, but no one was able to supply this information, and no-one in Australia knows whats goin on with engines.

I really hope you guys can help me with this one, sorry for such a long question, I just like to make everything clear, so there is no confusion.

I understand some people just slap an engine together and I goes great, but I just like to make real sure. :D

[Bill O'Neal]

If you run high quality pump fuel, at or above 92 octane, you won't have a problem using a #3 (smallest base gasket size from SD). Lowering your clyinder by a few thousandths won't make any differences that you would ever notice. Getting the squish closer would make a bigger difference, but nothing too great. The carbon buildup on the rave valves is sometimes more than what you are worring about....
And, Les Cooke is in Australia, and definetly knows his Sea Doo's..... Ask around.