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The Westcoast head is like a milled stock head with changeable domes. The good part is that it uses a stock 61X head gasket that will never leak or have corrosion problems. The ADA head is girdled, which has become important for fear of cylinder cracking. It uses no gasket and is more prone to...

Spin the shaft by hand and feel for seal drag, it should be noticeable. If it spins too freely, replace the seals.

I think a 11-17 is too much for your setup, get the 10-16. It will be easy to lighten the load from there if needed.

It is an old straight 16.5 which is probably too much load.

One of the requirements of AVGAS is a minimum shelf life of two years. I have antique Suzuki with a three year old tank of mixed pump and avgas that still starts on the first kick every time. For storage there is nothing else like it.

OEM cylinders are like OEM hulls anymore.

A +4 crank and 6m6 cyl will work with its low transfers but suffer from lack of port area compared to a 701 cyl. A 701 cyl on a stock 6m6 low end is the cheapest way out of a 650.

Kawasakis tend to break rods at high sustained rpm, it happens consistently enough to be a design flaw. Every engine has limits based on design and quality of mfg. Quality is usually the weak point of mass produced products. As a consumer the only questions should be about life expectancy and...

Kantz did a barrel roll on an x2 at the WF in 93, ten years later it was all everyone wanted to do. Its interesting to watch an activity go from obscurity to an obsession in such an organic way. I never dreamed that so many would be willing to spend so much for a flip and spin. The next big...

They did beat all the 650SX in closed course, not so often in slalom. Once SJs were allowed, slalom had to go before they pushed out the 750s.

A stroker crank makes the engine bigger, so does larger pistons. People are spending a lot of money looking for more power, that is why all these parts are being made. There are many larger OEM engines that could, and in hindsight, should have been adapted from the beginning. Racing kept people...

The only way to make it responsive and have good power is with high compression, high octane, and a programable ignition. Lowering the cylinder will gain response at the expense of power.

Plus bikes have good charging systems and dont get a drink of water every ride. Small batteries work OK as long as ski starts quickly. You will miss that 12LB battery when you're in the middle of the lake all by yourself with a waterlogged engine.

For watercraft use? A 900cc fourstroke makes less power than our typical 701 . 90HP at 8000rpm would not make much thrust for playing and would be slower than a limited SXR.

These may rejuvenate the racing scene as long as they can provide financing for young males like they did for standups 20+ years ago. Racing has become a competition of deep pockets, so has freestyle. This has excluded almost everyone with the desire to compete.

Glastron was doing this 40 years ago in James Bond films.

Well, if you have 7% greater displacement and everything else is the same. What do you expect? At least read the old Gordon Jennings book, it is probably floating around the net. Tuned pipes complicate everything so there's a lot to learn.

IM10 is much weaker in shear than IM7, it would be a poorer choice for this application.

Or they may just replace the guy that paid himself millions in bonuses for filing bankruptcy. Wait, only airline CEOs get to do that.

At what RPM?