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Any good Mods for 1997 gsx 787?

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nb717

New Member
Messages
16
Location
Amherstburg, ON, Canada
Water Crafts
1997 SeaDoo GSX
i am new to jetskiing, and after a season with my machine, im eager to increase my top speed. my top speed now is about 63mph, and i want to see how much higher i can go. thanks.
 

brock1

New Member
Messages
1,716
Location
MICHIGAN BABY
Water Crafts
1997 seadoo gsx 787cc 1989 seadoo....2 1996 polaris slx 780's, 1995 seadoo XP. 1996 xp 800
i have the same ski and really you are only doing about 58 on flat water and a good wind.... but as for the mods....new impellar......new intake grate......ported and polished........new exhaust......high spark wires.......play with carb a little (IF you know how)........ but remember with all mods you runa high risk of frying your engine especially a new pipe.... a high compression head
 

bigJake

Well-Known Member
Messages
4,188
Location
Pittsburgh, Pa
Water Crafts
96 GSX, 97 GSX,
I'd say you're running pretty good. got the same ski too. if you're runnign that good, i personally don't see the point in spending hundreds for 3 extra mph
 

nb717

New Member
Messages
16
Location
Amherstburg, ON, Canada
Water Crafts
1997 SeaDoo GSX
I'd say you're running pretty good. got the same ski too. if you're runnign that good, i personally don't see the point in spending hundreds for 3 extra mph
I definitely do not want to fry my engine... Also, do you know any required maintenance I should do, as I just hit my 100 hours. I'm very handy, and want to stay away from the shops
 

brock1

New Member
Messages
1,716
Location
MICHIGAN BABY
Water Crafts
1997 seadoo gsx 787cc 1989 seadoo....2 1996 polaris slx 780's, 1995 seadoo XP. 1996 xp 800
hours really arent important on a 2 stroke they just need the basics.... have you
1)changed gray fuel lines
2) Rebuilt carbs
3) cleaned rave valves
4) changed oil filter
5) changed out oil pump lines(the small ones on the pump)
6) changed water pump lube
 

Thumper3322

Active Member
Messages
656
Location
Courtice, Ontario
Water Crafts
1999 Seadoo SPX
I was talking to a seadoo dealership guy yesterday about my ski. He has the same ski as you and runs 67-68mph. What he did... new impeller, bored out the very end of the peice that covers the jet pump that affects the trim (can't remember the name of it sorry). Made that outlet a bit bigger to get more water through, and made is trim higher. He says he runs 7400-7500 rpm now pushing the 67-68mph on the 97 gsx. Just repeating what he told me. Sounds like it might work, without Fin the engine. :)
 
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