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How to make a Seadoo GTX faster and runs better?
- Thread starter virgilsc
- Start date
- Status
As Rampage said for the most reliable is to leave it stock. Rotax engines put out more HP per CC then any other PWC engine. The manufacture has already pulled out the most power you can get and still maintain reliability/longevity.
That said with a 787 engine you can have the head shaved down just a little to increase compression to about 160PSI, you would still be able to run 87 octane pump gas and gain a little bit of power, while not affecting reliability much if any. You can install aftermarket flame arrestors, a better/aftermarket scoop grate, better/aftermarket prop.
Those items will greatly improve ski with out affecting reliability. Beyond that there isn't much else you can do with out increasing stress on the engine/driveline and reducing reliability.
-TheChad
That said with a 787 engine you can have the head shaved down just a little to increase compression to about 160PSI, you would still be able to run 87 octane pump gas and gain a little bit of power, while not affecting reliability much if any. You can install aftermarket flame arrestors, a better/aftermarket scoop grate, better/aftermarket prop.
Those items will greatly improve ski with out affecting reliability. Beyond that there isn't much else you can do with out increasing stress on the engine/driveline and reducing reliability.
-TheChad
Wire4Money
New Member
Bill Oniel Watercraft Magic jet/flame arrestor kit, then an impeller
SabrToothSqrl
Well-Known Member
Gtx
get one with the 947 engine in it...
get one with the 947 engine in it...
get one with the 947 engine in it...
You'd have a more reliable engine by heavily modding the 787 then you could get even with a STOCK 947!
-TheChad
djredman99
New Member
Facts are Facts. :banghead:
Becides, his post "Just get a 947" was completely useless and unhelpfull to the OP's question.
:troll:
-TheChad
djredman99
New Member
LOL...Perhaps you don't have a sense of humor but it was a joke, I'm sure.
Wire4Money
New Member
Not always. I have a stock 951 (98 gtxl), a modified 787 (96 gsx), and a heavily modified 787 (96XP limited class race). The 951 is very powerful. I bought it blown up, built it from the crank up, and has ran great for years. The 787 had to be rebuilt due to a clogged oil filter. It will get dominated by the heavier GTX. The XP (factory pipe, aftermarket carbs, etc.) is very tempermental, and has a tedency to detonate the rear piston. If taken care of, a 951 is not a bad engine.
SabrToothSqrl
Well-Known Member
947/951.
The 951 is... BIGGER... than the 787.. which makes it... more powerful and.. FASTER...
130HP vs 110... 110 is less than 130...
My '98 GTX LTD ran 9 years and 340 hours before sucking in water and blowing up... with a factory 951. so... I don't really consider 9 years of perfect running (not a penny in parts)... that bad for my money...
It was partially a joke, however the 951 does fit a lot of skis... and it's the biggest 2 stroke sea-doo made... therefore even if it's not the 'best'... it's the best for the application.
So, yes if you want a faster GTX, get one with a 951 or do an engine swap
Theres no replacement for displacement!
The 951 is... BIGGER... than the 787.. which makes it... more powerful and.. FASTER...
130HP vs 110... 110 is less than 130...
My '98 GTX LTD ran 9 years and 340 hours before sucking in water and blowing up... with a factory 951. so... I don't really consider 9 years of perfect running (not a penny in parts)... that bad for my money...
It was partially a joke, however the 951 does fit a lot of skis... and it's the biggest 2 stroke sea-doo made... therefore even if it's not the 'best'... it's the best for the application.
So, yes if you want a faster GTX, get one with a 951 or do an engine swap
Theres no replacement for displacement!
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