SD 951 as a freeride/freestyle motor

SXR-FOREVER

Finally Flippin
How would a Seadoo 951 work as a freeride/freestyle motor? Might be able to get my hands on one cheap but wont if it will be only good for top end if I put it in my SXR.

Just letting the mind spin about winter projects, let me know your input!

Thanks
 

Jawbreaker

Rick James Edition
Location
Music City, TN
As for powerband, these motors are VERY impressive and in a light ski can be set up more aggressive to really make it come alive. The port shape/timing on it is probably the most aggressive for any PWC motor in stock form. The weight of this motor is less than the Yamaha 800 and makes almost 15 more HP & more torque.

However, since this application you are talking about is freestyle/freeride, the carb placement would be my biggest concern. If you are creative, you can easily make a sealed snorkel type F/A to eliminate this problem.

Convert the solenoid raves to gas (like the 787), use a digital TL to simplify tuning and wiring, run stock 46i carbs with a Coffman pipe...plop this in a 250LB hull/driveline stand up and hold on.

Marz831,

Tell me what PWC motor actually likes water ingestion.
 
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eel

Our home is girt by sea
They are gas driven from case pulse through a solenoid valve controlled by the mpem.

I would be tempted to run oem 99+ ignition reflashed to Mark Underwoods curve. You could shorten the harnesses and have a very reliable and sano install. You can do stuff with the stock ignition that you cannot with a msd.

Another option if you want to keep the charging system is to change the flywheel cup to a 785 or 98 951 type and run a 785 enhancer. The seadoo 785 enhancer has dip switches like tl so you can change curves and rpm limit. You will have to run the raves off exhaust pressure and you can only get 29deg max advance but I doubt if this would be an issue in a pole ski!

Hmmmm, Cut the stock head, rinaldi reeds and 48 F booster novi's........HOLD ON!!!
 
most of the water ingestion problem stemmed from the leaky gasket from the manifold to the head pipe. It would shoot a stream of water into factory airbox. In addition alot of the xp's had water injection problems from water entry around the front storage tray and intake tube. I don't think the design of the motor was the culprit. I believe you could easily develop an air box to make up for the carbs hanging low. Im pretty certain they are heavier than the yamaha 800 motors, they have a counterrotating shaft. I know that a 1200 cc (seadoo 951 based) sxr is going for a standup speed record at havasu this coming weekend, its the one on the peak website linked in a post above.
 
The weight of this motor is less than the Yamaha 800 and makes almost 15 more HP & more torque.

No the Seadoo motor out weighs the 66E. I'm not comparing with PIPES because that isn't realistic with a transplant. The motor itself is heavy relative to a 66E which can be a good thing.

That is probably why it's in the GP ski's. Weight helps in closed course racing standups.
 

SXR-FOREVER

Finally Flippin
this may be really fun... I'll have to look into maybe getting this 951, but we'll see.

I was thinking the same thing about the "snorkel" type flame arrestors..

Anyone know the stock HP ratings of a 951?
 

Crab

thanks darin...noswad!
Location
Seattle
this may be really fun... I'll have to look into maybe getting this 951, but we'll see.

I was thinking the same thing about the "snorkel" type flame arrestors..

Anyone know the stock HP ratings of a 951?
130
587 motors are 55-60hp
657 are 70hp
657x are 85
717 are 95
787 are 110
951 are 130
 

eel

Our home is girt by sea
this may be really fun... I'll have to look into maybe getting this 951, but we'll see.

I was thinking the same thing about the "snorkel" type flame arrestors..

Anyone know the stock HP ratings of a 951?


130 claimed. With just arrestors and basic tuning, you can get a 950 to push an XP into the mid 60's. I dunno about fitment but the stock pipe may be a better option on a freeride ski. With the 950's, there are really only 5 different pipe setups.

Stock grey motor, good bottom and easy to tune. A good allround no fuss pipe. (seadoo's aren't like yammies, their stock pipes are better designed than half the AM superjet pipes!)

Stock white motor, different manifold and header. Makes more power a bit higher. Suits modded motors better.

Coffmans, Dry pipe. can be a bit finnicky to tune, revs hard but makes schit power down low. Most people prop down when running this pipe.

FPP twins (long chamber) big fat power everywhere and will run on stock motors. Complexity and mounting make it pretty much racing use only.

FPP twins (short, or Franko chamber) Racing only. You need a tough big bore to make these work. Silly power on the right engine. (will push an xp into the mid 70's)

Good luck getting any of the twins to fit in a sxr.
 
If the motor is comparable in weight to the 66e, this could be a awsome/powerfull/very affordable power plant for a Trinity SXR! That would be a sick monster, it the motor isnt to heavy. :headbang:
 

eel

Our home is girt by sea
EEL you forgot 1, probably the best pipe for low end on a 951- The very rare Rossier :shocked1:
Bri


You are right, They are that rare that I have never seen one down under.

I also forgot those gay r&d tail cones.
 
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