A friend sent me this post from a personal watercraft tech chat site. If
this guy is for real he should make Darwins list;

Porting trouble

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Hey guys, I've got a 93 Superjet. I've had a pipe and modded ignition for a
while and wanted to get more performance. I was recommended to port and
polish the intake and exhaust ports. We found out they used abrasive
material to do it like gritty sand. So I got with my friend that tunes Fords
and we decided to try it ourselves. We got a bag of sandblasting sand and
hooked up into the intake and started the ski with it hooked up to the flush
kit. We had to hold the gas so it would run. He wanted to let the engine
suck in the sand through the intake so it would port it out and then push it
out the ehxaust so it would port the exhaust port and manifold.

I was worried that it might cause problems but he figured it'd be OK as long
as we added a little more premix than usual. After running it and letting it
suck in sand we got about quarter way through a 25 lb bag. The engine was
bucking and kicking and sounding really weird. We stopped and hooked the F/A
back up normal and took off the sand supply. We tried to start it again and
it was really hard. Once started it couldn't idle and kept making weird
noises. We just kept trying to run it to blow more sand out but it started
to make scraping and knocking noises.

Help! Can anyone tell me what to do! My buddy only does Fords so he doesn't
know much about Yamaha pwc motors.
__________________
650 Superjet

(Can anyone actually be this stupid?)
Dixon