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A 2.0 is the "one size fits all" needle port. It will allow springs to cover the whole useable spectrum and flow more than the pilot and main jets combined.

Needle port diameter plays a role because pressurized fuel is trying to push it open. Without fuel pressure we would be concerned with the spring tension only.

As peviously mentioned, a small wire brush on a Dermel will knock off the dried crud without hurting anything else. Just use slow speed and be careful.

Those dont look all that bad. Salt water is usually worse but fresh will do the same thing. Your story is all too common and the reason I never buy used carbs and cranks.

A stock 701 superjet engine will bolt in with the use of a 650lx coupler. Just find a place for the E-box and heat/expand the exhaust hose to fit. BTW the pump wont hold a 701 below the rev limit.

Look for water and debris in the tank, filter, and carb. Also make sure to check the carbs internal filter basket. It is difficult to hurt a stock compression/pipe 701 unless very poor gas was used.

Old K&N filters had fiber that will swell and constrict air flow when wet. Now they make flame arrestors for watercraft without fiber in them. Even better find a stock Yamaha 650-701 single carb arrestor, they will bolt on any mikuni 44 and do a better job of keeping water out.

There is simply no reason for ANY twostroke with a tuned pipe to be loud. They can be quieter than stock without any power loss. The powerboat crowd have no excuses either since they have room for a good muffler. Poor behavior transcends all tax brackets, especially at the lake.

So the TDR was loud enough to upset someone off the beach. If it is annoying at that distance then it is certainly annoying to beach residents weather they complain or not. Why is there an almost perfect correlation between jetskiers and obnoxious behavior??? Reinstall the stock muffler and...

Adapt an SBN 38 and lean to peak power for best fuel economy. Your 650sx must be set excessively rich because they usually have the longest legs of all skis.

Do they work well? What is your goal? They take up air space so the pump primes faster, that is why they are useful in white water. They will not do anything for thrust in clear water.

Gel-coat is used in open molds because its cheap. Paint must be used on parts made in pressure molds like SMC. Paint is much more expensive but also more UV resistant than gel-coat. A single stage Imron or equivalent is best overall. Look to industrial, heavy equipment, or aircraft supply...

If you have a title in your name then make ID plates to match, legal or not its difficult to get caught, that's what your buddy is doing. Most states require an inspection for homemade boats to make sure someone is not laundering stolen vehicles. Cops may be dumb, but they can usually look at...

Idle mixture needs to be rich of peak on the trailer for best response. He needs to get some experience tuning a leaf blower or model airplane engine before moving on to something as costly as a jetski. Better stick with a leaf blower since the model engine can cut your fingers off.

At least shipping is free!

A concave plate has the effect of adding fins to a flat plate while remaining race legal. They make the ski want to go straight but also reduce steering authority. Extended plates are for faster planing and porpoise reduction. This keeps the hull flatter in rough water but make it harder to...

They are about the same load as a Skat 15-18 and 10-18. OK for riding fast but doodoo for low speed thrust. Find a Skat 12-17 small hub swirl or a Solas "S" 14-17 or 13-17 concord and bore your nozzle.

I have an old Sizzler with no ribs, I once saw a coffmans 550 pipe using a cone that looked the same as my Sizzler but with ribs. Maybe Coffmans consolidated parts between the two before they quit making them.

You probably need to tune the pump to match that mod chamber.

Leave nothing to chance, mark the flywheel and use a strobe to see where the timing actually is. The timing should retard to around 16 degrees at high rpm for low octane gas. The cdi marked 3738 is best for older style stators. I never messed with any newer DC ignitions.