1983
Well-Known Member
Awesome, thanks
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The X4 Thread
- Thread starter purple_people_eater
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Awesome, thanks
seadooaddiction
Active Member
Seadoodoc
Active Member
Great question IDO. There is no inherent design flaw in Seadoo 951 mtrs other than your spinning twin MONSTER pistons at high rpm. When things go wrong it gets mechanically- financially ugly relative to 657 gerbil mtr. Huge strides have been made during last decade keeping these mtrs alive.
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Seadoodoc
Active Member
Couple issues. When a piston the size of a small block chevy seizes the crank rod on 951 breaks thus becoming an aluminum chain saw. Early years in racing we used Honda CR 500 rods, challenging because they are 1mm shorter but unbreakable. Hot Rods now builds very robust crankshafts. Piston durabilty under poor tuner choices was next hurdle. The factory SD 951 DI built a piston with much taller upper ring landing to support the mtrs high compression and operating temps. Wider makes a duplicate piston. There is no replacement for displacement. 135 hp is a magic number for an X4 making them a a white knuckle ride. Achieving this by building a 787 high strung 7500 rpm expensive high maint mtr, or bolting in a stock 6700 rpm 951. I will personally never mess with those 787 mouse mtrs again. 
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IDoSeaDoo
Well-Known Member
So you're saying a 951 with a hot rods crank is the way to go? What's a better piston for it than original? I've never heard of the brand wider. Do you mean wiseco?Couple issues. When a piston the size of a small block chevy seizes the crank rod on 951 breaks thus becoming an aluminum chain saw. Early years in racing we used Honda CR 500 rods, challenging because they are 1mm shorter but unbreakable. Hot Rods now builds very robust crankshafts. Piston durabilty under poor tuner choices was next hurdle. The factory SD 951 DI built a piston with much taller upper ring landing to support the mtrs high compression and operating temps. Wider makes a duplicate piston. There is no replacement for displacement. 135 hp is a magic number for an X4 making them a a white knuckle ride. Achieving this by building a 787 high strung 7500 rpm expensive high maint mtr, or bolting in a stock 6700 rpm 951. I will personally never mess with those 787 mouse mtrs again.
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Seadoodoc
Active Member
67mph
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Have not tested since first day . We clicked off 68.4 . We have it so agressively glued to water now for buoy racing i would surprised if hits 65mph. First race he did beat twin 08 rxpx 255 boats to first buoy. It really does not feel safe above 65.
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Seadoodoc
Active Member
There is a couple videos on you tube under 951 x4
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Seadoodoc
Active Member
All the boats I have built end up in the Doug Lawanakis 2 stroke museum in his cabin in Oregon Cascade mountains. He has at least 100 machines from sleds,to scooters, race boats, . Neat place. Im typically so overwhelmed at display in his shop my phone never leaves my pocket. Hx 787 carbon mod is my fav
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98GCLimited
Active Member
Can someone, with factory graphics still on, measure and tell me the length and height of the SEADOO decal on the hull below rub rail. Just the length from the long lower leg of the S to the end of the second O (dont include the pink stuff just the lettering) and also the lettering height. Im looking to get some decals and not sure if I want to go with 24" 32" or 36", I want it to look like the factory sized logo. Ive found several decals, Im thinking 24 is too short and 36 might be a little big but not sure yet.
Thanks ahead of time.
Thanks ahead of time.
98GCLimited
Active Member
Thanks for your input Dan.
That was one of the places/sizes I was referring to, I saw his seadoo hull logos are 32" long x 3 3/4" tall. Hes got under industry logos > seadoo 8" 12" 14" 18" 24" lengths also.
Theres also one on ebay called a windsheild decal thats 36" long x 4" tall. I might get one of those in matte black to put on the rear window of my Jeep. Theres also hull decals 2x 32" long and 2x 8" long for $26 shipped, height is not mentioned. And yet another one thats 31 3/4" x 3 5/8".
Seems like the 32" length would be about right on the hull.
98GCLimited
Active Member
Thanks Dan, thats perfect.
njrealtor55
Active Member
951 x4 can be as fast as 74mph, but you need to bleed pump pressure or it will stuff the pump and kick you off. ask Brian Baldwin.
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