In my personal experience, owning a 1993 550sx with reed engine, a 1995 FX-1 and a 2019 Super Jet, the comments by
@streetroc and
@WFO Speedracer above are spot on.
I can't wait to get my 550x running again (I don't think I have ridden it since buying the FX-1 six years ago), so that I can compare the 550sx with the FX-1.
As far as the FX-1 vs. the SJ's, yes the 2019 SJ and my wife's 1994 SN SJ both feel like heavy pigs in comparison to the FX-1.
One of my buddies who still has his FX-1 from the days when he bought it new or was sponsored with it new, says that the SJ will feel more nimble once I get a pipe on it. But he does appreciate the linear throttle response of the stock exhaust but hates the lack of power compared to what it would be with a pipe.
But the SJ's are sooo much easier to ride. It is so easy that it is almost not fun. So on the SJ, I am just trying to do everything while riding faster.
I highly recommend
@waxhead 's rear sponsons on the FX-1. And I am in the process of installing Tom's front sponsons on it too:
Both my wife and my buddy agree that they help the FX-1 carve turns easier, but they call them "training wheels" . . .
Why slide? Carve like the pros! Introducing the Wax Racing Products Billet 6061 Anodized Buoy Shredder Adjustable Sponsons. Forget about re-drilling your hull to fine-tune your ride. With our buoy shredders, you simply unbolt the blades, loosen the body, and adjust them up to 100mm in each...
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At some point, I would like to try a shorter, wider aftermarket hull.
This review should probably be put right here: