yeah, +1 on 550subman's comment!
440 pumps are definitely better. I have a 440 that I dropped a 550 into myself. As far as I know the pump is the only difference between the two.
-1984 JS550 clone -
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, 440 pump, Skat Trak, primer, thumb throttle
-1987 JS550 - bone stock
-1985 JS550 basket case