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Two part urethane foam wont melt when gasoline gets on it. Pour it in thin layers, this will keep it from bulging the hull and help decrease water absorption. Anything behind the bulkhead should never get wet since you can seal the compartment. You can make a small bilge area in the bottom of...

If the head and cylinder is not flat it will leak regaedless of the O-ring. Look at the pisser stream when riding, If there is a head leak it will be broken. Solid stream means no leak.

Actually tuning a leaf blower is very similar to a jet ski. It’s nearly impossible to hurt an engine that’s set rich of peak power. A piston that is fitted with less clearance may run forever with a cooler main jet and then seize the first time combustion temps rise. Always start too rich and...

Old skis that run are usually a bad deal economically since they were almost always poorly maintained. NOBODY will ever maintain anything they have lost interest in. I separate the hull from everything thats inside it. That way its easy to become an expert on keeping all the parts in good...

Head bolt threads can be easy to strip but they are also easy to repair. Sometimes you can just use a longer bolt and pick up enough fresh threads. It is difficult to get a lot of useful information from the goo on top of pistons. You can get better and faster information with a tachometer.

It all started with people cutting off the rear of a Superjet until it was short enough to flip easily.

It takes a lot of man hours to develop the hull shape that you want. On watercraft very small changes to the bottom shape will make huge differences in the way it handles so you have to get it right through testing. Many builders just modify and copy existing hulls. Either way once you have the...

Exactly. Nose up and unplaned is a completely different mode of riding than going 15+MPH. As I have said before, a short hull cant race and an SXR1500 cant flip. Freeride hulls are somewhere in between.

The 750ss/xi driveshaft will fit 650sx hulls. Its an easy way to adapt 750 impellers with minimal cutting.

Its rider size and how much hull area behind the center of gravity that determines how difficult it will be to get planed. Little guys can ride anything, big guys will need either more aft area or be able to crawl farther up on the ski in order to ride away. Often a little negative trim makes...

The problem with aftermarket hulls are that they start a little shorter and end up a lot shorter. There should be more discussion about this but it will never happen. About the best way to judge the balance point is by assuming it has a Superjet driveshaft and seeing how far the pump sticks...

Superjets are too long for a backflip but they can do rolls. Everyone caved in the right side of their hulls trying to do it. I made some full length slots for mine and they made the ski much more comfortable to ride. Many local riders were molding and installing foam wedges inside the...

That is what a company with overhead would need to get in order to stay in business. This is a hands on hobby so most guys like to do it themselves.

The accuracy of these are a lot better than whats required for the ultra rich fuel/air mixtures we run.

Points work great in magnetos.

I have ridden a Group k 850, it ran fine and was reliable. I would use the larger sleeves with a smaller 85mm bore if it was installed in a Superjet or any other longer hull that got a lot of full throttle runs.

A pair of 44s will make very close to full rpm at 5/8 open throttle. A pair of 38 need to be open a little more but will do mostly the same thing. Large carbs will make the pipe hit harder at low speeds but thats about all.

If it ran out of oil with the nose up then it could also run out on acceleration. Yamaha engineers cant be that bad?

A lot of those A/M boxes have the outlet tube further from the bottom than stock. They may flow better when dry but they never suck all the water out.

These are the same guys that sink their skis and let them sit full of water. The sport needs the faces and their $$$ even if the quality is low.