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do you have any idea what curve is in your ignition. Do you know what your port heights are.

That will be fine with the jets I have given you. If you had a digital ignition you could put more timing in it and then you would need bigger jets. However the set up you have is quite basic in the overall scheme of things and the jets I have given you will be close

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All the fast race boats are reverse jetted. So I guess so that answers that.

125 low 110 high 2.3 ns 20 psi pop off

you could gold plate it ??

Maybe the hull was on the plane

I think the kawi has the benefit of a longer stroke and the limitation of terrible cases from the factory. The yamaha has a completely dry exhaust and a better pulse tuned manifold than the kawi. My choice is the yamaha over the kawi

Here is a build on an 1100 Im doing. an extra cylinder but you get to see the cases http://www.greenhulk.net/forums/showthread.php?t=212410

;)Im interested to learn about this as well

Disconect the stop switch, I have seen them corrode behind the plug and cause a misfire.

Damn you. Know they are hard to come buy. That was my trick as well

They also have a good thick dome. So if you need to machine the engine to run positive deck you can no issue

There is a certain amount of stretch in the con rod bearing piston etc the higher you rev it the more it stretches.

Set your squish so that your pistons hit the head 1000 rpm higher than your rev limit. You don't get deto when there is nothing there

That's awesome glad that curve worked for you. I'm looking at one of those for my next build as well

Solas with a stainless steel cast liner. Awesome .

You want to have a look at outboard triple pulse tunning before you say the yamaha pipe is bad. its a whole lot better than the kawi pipe where the runners are to long to pulse tune. Nice build up ski looks and sounds good

But your saying that two strokes are more expensive to maintain. I would disagree with that one. i have seen so many lunched 4 stroke mx bikes with riders in tears. I would never own one

Im interested in Are you sure about these points ?? Valve seat recission and broken timing chains toom more people out of mx than I would care to count. Im not sure what four stroke you are running but they are very expensive to fix and maintain