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if you get to looking real hard, some carbs will have a "H" or "L" stamped/embossed on them near the screws. but some dont...
 

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I hope this is what your carb looks like.



#17 is the Low Speed Mixture Screw
#21 is the Pilot (Idle) Mixture Screw
#24 is the High Speed Mixture Screw
#14 is the Throttle Stop (Idle Speed) Screw

Carb tuning. JS440. - PWCToday
 

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i dont know about the rev limiter issue but i'd start with the stock 550 needle settings and tweak from there.

here are the stock settings
 

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I leave mine on the trailer but in the water on the boat ramp to fiddle with the mixture settings. that way i can work the throttle and play with he mixture but not go anywhere or have to balance.
 
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