97.5 - 98 155 mm pump questions

[tobytd]

Hi everyone, new here, but have been doing a LOT of reading.
I have several ?? about 97.5 / 98 155 mm pumps ( mine is a 98 GTX Ltd.)
1. mounting bolt pattern / spacing -- pump / pump support & shoe, different?
2. impeller (mine is P/N 271000907) all the same?
3. takes a different impeller shaft & bearings
4. no neoprene seal will one fit? any advantage to put one in?
5. hubs - cones any difference ?
6. wear rings -all the same?

Thanks!!

 

[Matt Braley]

The 97.5 GSX had it's own pump, impeller and nozzles. Racers used to like them in certain situations. They are the first 155 pumps and have a small hub where all later style 155 pumps had a big hub. They fit and later pumps will fit on the 97.5. There is not neoprene seal because the 155 pumps have a rubber seal that seals on the outside perimeter of the pump instead of sealing pump to hull.

 

[tobytd]

thanks Matt
the rubber seal is in the pump support?
small hub means 'special' (wont fit newer pumps) impeller shaft & bearings
will this pump bolt to a 99 & up hull?
you said 97.5 GSX what about GTX & XPs

 

[tobytd]

I found the rubber seal (under behind) wear ring
97.5 GSX only?

 

[Matt Braley]

The only half year model in the nineties was the "Grey Ghost" 97.5 GSX. Other then that they are all 155mm big hub made of either plastic or brass