Kawi2strokes.com Forum

What about the ridges in the ring land area of the piston? Is that how they come from wiseco?

yes.

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........

The four base gaskets yielded 3.2mm squish. Piss poor indeed. One gasket yields a 1.2mm squish. We are going to run it stock gaskets and see how the comp ratio works out. Too high, double the head gasket. Wonder what they were thinking?

As mraxl has stated, you will really have to know at what position your ports are as compared to a stock cylinder.

Whoever did this ended up with a 2mm lift on the transfers and the exhaust port and minus 2 on the intake port. The piston would have to be cut 2mm just to restore the stock timing (which it appears it was, and then some) unless the intake port floor was lowered.

Depending on how much the exhaust was further raised your engine may have been far from a dog! The stock squish gap sucks anyways so your excessive gap only controls the compression ratio..

If you return to single stock gasket you may now have a too severe piston cut, as lowering the cylinder will increase intake duration on its own. This will likely mandate new pistons.

You may want to make a correct cylinder shim as suggested. If you don't want to deck the top of the cylinders (so you can go back to close to stock with new pistons) you can re-work a head that actually sits down the bore to correct the squish gap (aim for around 1mm).

If you like the setup the final optimization would be to lower the bottom edge of the transfers and the exhaust floor (if they have not already been done) at the bore back to the stock position (typically close to flush with the piston crown at BDC).

Depends on what you want. With big carbs and chambers (that actually work) it appears you could very easily end up with a high HP high rpm screamer.

J

Chris Ritchie makes some real nice cylinder spacers.Maybe do some port timing measurements and give him a call. Then cut the heads to suit. It will go like a wild thing

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I am just a man working in a tin shed.

Man I can't wait to kick this thing in the guts!

'ATTABOY!!!

Glad to be a "bad influence"!!

J

it looks like the divider at the bottom of the transfer has a sharper edge than normal. Has a grinder been in there?
What do the roofs look like? (still rough cast?, or like they have been sanded/grinded/polished?)

I need to get over to my buddy's shop today and look again.

Hard to tell on the transfers, they are polished but until they are measured against a stocker who knows. If anyone has an unmolested cylinder to loan me that would be a big help.