650/X-2 SX vs JS

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I've been riding a JS440 and JS550 for a few months now. I've gotten pretty good riding them. I'm looking for the next step and I see lots of 650SX around for good prices. How much better is an SX vs a JS?
I'm a pretty light guy so I don't think I need a 750SX or SXI Pro.
I know everyone is going to tell me to go to a SuperJet but I only find those for 3 times the $ I find SX's for.
Thanks
 
A 650sx is more like a step sideways IMO. They have a little more power but they feel quite a bit heavier too. I went from a 550SX to a 650SX and in retrospect I wish I would have kept the 550 and bought a pipe for it and maybe a couple other performance parts instead.
 
Find a cheap sx and swap that motor to the js hull :) viola thats a big step up from the 440,550 there is a bunch of thread out here or in pwc that can help u to do the swap goodluck
 
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