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Since your cylinder has been cut and you didnt mention pump specs, I recommend starting with a 200 main jet an the top screw 3 turns out . This should be way too rich but its where you have to start whenever you're not 100% sure. Get 120 thru 130 pilots and a 160 and 175 main. The pilot...

Thats what I remember. Dennis Kirk was liquidating all their jetski crap on ebay in the early 2000s. I got several new plates for less than $20.

I would bore the nozzle and bend the prop a little flatter. This will make it come to life quicker and pull noticeably harder without touching the engine. Raising compression may make it more snappy but fuel quality and carb tuning will be more critical. Basically it will be easier to stick a...

I had a plate on a 750 that was corrugated like the roof of a barn. It had more straight line holding than anything including winged OP and Jet Dynamics plates. Cruising around you had to put the bars against the stop and give it al lot power to turn. That plate made it easier to hold on an...

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Lets start with the basics, low port 61x cyls have better throttle response, which better for standups. High port 62t cyls make more power, which is better for couches. A Blaster is just a small couch. A good pipe is absolutely necessary, especially so as exhaust ports get higher. Any 62T...

Did you ever confirm your main circuit was set rich of peak rpm? Did you open the top screws to compensate for cooler air? Are you sure the gas was good? Any one of these factors alone will stick a piston. At this point, you need to remove the engine and inspect/repair everything. Start with...

Try lowering the pump load, first bore the nozzle then flatten the impeller. Making the pipe longer will reduce power and thrust.

Anyone try using a 760 gasket? There should be enough room to cut and shim the domes to restore squish.

I have not found one shape that pulls any harder than the other for a given diameter. I have noticed that the stream fans out and spirals more on straight bored nozzles with out vanes. Taper bored nozzles with vanes have a more compact stream that does not spiral as much. My superjet didnt go...

Everything has to be correct to get the absolute most out of whatever "it" is that you desire. Most poor performing skis are just miss loaded or piped. For an experiment in case porting, throw your favorite top end on a 650 case. It probably wont be as bad as you would expect.

Opening the window may be beneficial all else equal. Power is mostly in the cylinder and pipe. A programable ignition can improve response and use cheaper gas.. Theres a lot more thrust gain in a "mag" pump and bored nozzle than ANY case/carb mod.

Everyone needs to understand that our equipment is operated near its limit and in extreme conditions. The life of any used part is likely to be "used up". Fortunately, corrosion, chaffing, and cracks are easy to see and a very good indicator of its owners attitude toward care and...

Make a large removable pad that can be strapped to the top of your pole for riding in deep water.

Raising the outside trailing edge will unload the pump noticeably. Just hold the impeller fore/aft in a soft jaw vice and bend the trailing edge up 1/8". I made a custom tool but a heavy hammer will do as well.

There may not be that much actual fuel vapor under the hood., its difficult to tell. Enough fuel will slowly run out of the pilot ports to make it stink. All my skis smell of gas for weeks if I leave the hood locked down.

It looks like the venturi was left in place so they may be easy to tune.

Many carb mods fall under this category but it doesn't stop very many from spending lots of money on the subject.

I can get some after fire If I rev the engine when its very cold. The idle mixture is easy to set on the trailer. Open the bottom screws until the idle rpm settles down, let the engine warm up and see if it still pops.