300/440/550 modding a 550

this summer i bought my first ski, an 89 550 sx. what all can i do to this machine to extract more power from it. im not looking to set any reccords, i just want to jump a little higher and farther.
 
it should already have a 44mm carb on it. changing from the rb carb to a sbn 44 carb, higher compression head, fpp half pipe & 15/15.5 prop will do alot & not totally kill reliability with proper jetting.

Put a good prop in it first (if you havent already). the aluminum stockers wear out & basically suck

Honestly, find a 650/750 motor & swap it out... you'll love it.
 
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