Results 1 to 8 of 8
  1. #1

    Snowmobile Motor in Jetski

    My 96 SLT 700 recently had a crank seize damaging the case. I opted to purchase a recently re-built motor from a shop in Minnesota which my mechanic completed installing today. Runs fine.

    He tells me, tho, that this was originally a snowmobile motor but will run fine in my ski. He commented that snowmobile motors have more torque than the comparable jet ski motor.

    Does this sound plausible?


  2. #2
    Bing-A-Ding-Ding-Ding, Brrrrrap! Brrrrrrrrrap!!! Polaris_Nut#1's Avatar
    Join Date
    Aug 2006
    Location
    Pittsfield, MA
    Posts
    3,350
    +1
    26
    It is quite possible. the domestic motors share a lot of components, but a lot of stuff would have to be swapped to make it work.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,599
    +1
    1,276
    Quote Originally Posted by floridarandy View Post
    ...recently re-built motor from a shop in Minnesota... Runs fine.

    ...was originally a snowmobile motor...more torque than the comparable jet ski motor...
    Apparently snowmobile motors are ported differently than PWC engines, and develop torque differently across the RPM band. But that doesn't make the snowmobile cylinders a better choice for PWC use.

    You say it runs fine. How much testing has been done?

    Bottom end acceleration, top end RPM, mid-range response?

  4. #4
    Connecticut CrazyA's Avatar
    Join Date
    Nov 2005
    Location
    CT.
    Posts
    8,141
    +1
    1,051
    Quote Originally Posted by floridarandy View Post
    My 96 SLT 700 recently had a crank seize damaging the case. I opted to purchase a recently re-built motor from a shop in Minnesota which my mechanic completed installing today. Runs fine.

    He tells me, tho, that this was originally a snowmobile motor but will run fine in my ski. He commented that snowmobile motors have more torque than the comparable jet ski motor.

    Does this sound plausible?
    Really... he told you that, huh? What year and model sled? (be specific)

    Have you water tested (ridden) it yet, or are you saying it runs fine on the trailer? (because on the water under load will be the real test)

    Oh, when you get a chance, can you post up some pics? I'd like to see how the cooling system was done. Your watercraft transfers cooling water from the pipe, through the exhaust manifold, and into the engine. The sleds don't, although there are ways of doing it. Anyhow, post up some pics.

    Thanks.

  5. #5
    PolarisNut's Avatar
    Join Date
    Dec 2006
    Location
    Lower Michigan
    Posts
    1,809
    Quote Originally Posted by floridarandy View Post
    Does this sound plausible?
    Plausible, but HIGHLY unlikely for reasons already mentioned. 700 snowmobile cylinders would make the ski a dog.

  6. #6
    ski is 4 hours away and labor day is the test. i'll let you know. it seems more likely from what he said that the crankcase may have been from a snowmobile motor? he was looking for unthreaded freeze plugs below the exhaust ports.

    could the motor simply have been rebuilt using a different crank? i still haven't seen the motor but it was sold as a jet ski motor. had it shipped directly to mechanic at lake.

    here are the pics of the motor the seller sent.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	ski 1.jpg 
Views:	153 
Size:	13.5 KB 
ID:	148917   Click image for larger version. 

Name:	Ski 2.jpg 
Views:	106 
Size:	13.8 KB 
ID:	148918   Click image for larger version. 

Name:	Ski 3.jpg 
Views:	101 
Size:	15.5 KB 
ID:	148919  

  7. #7
    casey67's Avatar
    Join Date
    Sep 2006
    Location
    Lemont,IL
    Posts
    2,572
    +1
    35
    Quote Originally Posted by floridarandy View Post
    ski is 4 hours away and labor day is the test. i'll let you know. it seems more likely from what he said that the crankcase may have been from a snowmobile motor? he was looking for unthreaded freeze plugs below the exhaust ports.

    could the motor simply have been rebuilt using a different crank? i still haven't seen the motor but it was sold as a jet ski motor. had it shipped directly to mechanic at lake.

    here are the pics of the motor the seller sent.
    Looks like a PWC motor to me,from my understanding the PTO end of the crank is different for snow. Deffinetely PWC cylinders.

    My guess is he wanted a snow engine and bought a pwc to see if it would work.

  8. #8
    Connecticut CrazyA's Avatar
    Join Date
    Nov 2005
    Location
    CT.
    Posts
    8,141
    +1
    1,051
    Yeah, that's a watercraft motor. Maybe he just used the sled cases or something.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 95 750 motor in a 92 SL650
    By race24x in forum Polaris PWC Performance
    Replies: 38
    Last Post: 07-11-2007, 01:42 PM
  2. HELP N. Texas ! Need S.S. bolts to put motor in..
    By MAC_Attack in forum Southwest
    Replies: 10
    Last Post: 06-12-2007, 01:35 PM
  3. New Motor In!!!!!
    By GPRPITMAN in forum Yamaha PWC Performance (2-stroke)
    Replies: 10
    Last Post: 04-27-2007, 11:03 PM
  4. Anyone Put 05 rxp motor in 02gtx ltd
    By TNTDEALZ in forum 4-Tec Performance
    Replies: 3
    Last Post: 03-29-2007, 11:24 PM
  5. gp1300r motor in a gp1200r hull
    By superramjet in forum Yamaha Open Discussion
    Replies: 2
    Last Post: 02-18-2007, 12:37 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •