[tdfregeau]

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....

 

[JUST-IN-TIME]

you will need the 440 drive shaft also
flows more volume
really not worth it unless you have some serious mods