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I had a 1100 motor,case porting,mild exhaust porting,1100 chamber,1200 electrics,pro tec modded cdi,Bored out 38's and was running a 140 set back mag pump with a 16/21 prop. It went pretty good,but definitely was on and off with the tuning side of things. I removed the waterbox totally to try it...

Ive done this in an 08 sj. I reduced the exhaust to the sj size straight after the fx140 hose. Had alot of tuning issues due to too much back pressure. A buddy did the same conversion and we altered his exhaust sizing all the way through the hull and it was awesome.

Dude,if you have a single 44 you need a 120 pilot and a 145 main jet.1.5 N/S and a 95 spring.Set your low speed adjuster to 2 1/2 turns out and your high speed to 1 1/2 turns out .Try that before you go changing Cdi's etc. If your ski is dying like that it needs more fuel,not less.