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I started my son on a JS300. It was originally planed to be the "KX80" of the JetSki product line, but after the Consumer Safety Commission ban on Honda 3 wheeled atv, as I recall, an abundance of caution was felt at Kawasaki dealers, waiting for the next shoe to drop on top of JetSki's. The...

Kev T. I like your low speed jetting but not Keith T's low speed jetting, his appears to be lean. There are 3 basic jetting scenarios: 1) oem or what most people consider normal with a smaller low jet than the main jet. 2) Reverse jetting with low pop-off. The low jet is normally larger than...

E350, what guidelines did you use to design your O-ring grooves? Your O-ring diameter looks like it is larger than the cast iron flange on top of the cylinder. It would be bad if the O-ring mated against the cylinders aluminum casting. An O-ring head use o-rings that float in the groove...

The standard Kawasaki 650 rev limiter hits at 8000rpm Bill M.

Did you drill out our low speed bypass holes? or is the low speed circuit and butterfly stock? Bill M. Thee low speed bypass holes and butterfly angle are different than a std Mikuni. 3 Fuel pumps?

I am not very good at short answers, and I am no expert with the 1100. I used to own a 900, but they are very different. Since the mid 80's I have enjoyed repairing blown up engines, building pipes, and tuning. But not engine building. Was there something different about the air temp, or...

A lot of engine failures are incorrectly blamed fuel pumps, and lines. Bill M. Have you had an engine failure?

That is Pre-ignition, most failures begin with detonation and after they have seized several times, a piston will develop a sharp edge on the piston crown. When the sharp edge becomes hot enough, it will cause the engine to preignite, and melt the piston crown and expose the rings...

What pipe are you using, any porting? Bill Mazz

It wouldn't surprise me if someone cut the spring. Many shops will do this when the ski comes in for repair for being difficult or impossible to start. Check the pop-off pressure with the carb inside a gallon zip-loc bag, and be sure to use gasoline, or a light oil product (wd-40) to see if...

300 Jet Ski starters are easy to repair. The commutator just needs to be cut true, and reassemble. Bill Mazz