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Discussion Starter #1
I've heard that if you relace a pump assembly on a 550' with a 440 pump assy that the ski will have better low end .is this true if so is it a basic swap?

I have a 1988 js 550 and would like to put a 1979 440 pump on on it....
 

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BORN TO FISH NOT CATCH
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1,512 Posts
you will need the 440 drive shaft also
flows more volume
really not worth it unless you have some serious mods
 
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