Results 1 to 7 of 7
  1. #1

    need help on 1050/900/700 pistons cylinder and cdi info

    OK.
    i got a blown up sl 900 last year, I put 2 used 700 cylinders and used one of the 900 cylinders. (i have $350 into the whole ski) runs great

    I am big in to snowmbiles and i know alot of people take the triple engines and bolt on 700 (1050cc) snowmoble cylinders and they can make over 250hp ( with the right pipes at 8300 rpm) in a sled.

    my first ? is, has anyone tried runing snowmobile cylinders, if so how did you build the water jacket? how did it work

    second ?, has any one tryed runing 700 sled pistons in there 1050?
    the pistons are the same bore but the way the rings are on the piston are diferent. sled pistons are way cheaper I can get a whole piston kit for $59



    i have been reading alot of posts and it looks like alot of people want 785 pro ignition systems cus they let the engine spin up to 8,000 rpms

    all the the sled guys use polaris xlt,ultra or storm igintion systems. they will let the engine spin untile the rods fly out of the cases and you can get the whole set up for like $50-$100

    has anyone tried this type of set up?

    any info would be good,
    Last edited by brent9k; 05-14-2010 at 12:59 AM. Reason: more info


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,601
    +1
    1,277
    Welcome

    You are running two cylinders of 350cc each (the 700 cylinders), and one 300cc cylinder (the 900 cylinder) - have I got that right?

    There are some interesting interchanges of snowmobile and PWC parts, but there are some issues to be considered.

    Sled engines have a very different torque curve and different porting than PWC engines. The ignition timing isn't quite the same.

    The water cooling thing is important, of course.

    There are a number of threads discussing using Polaris snowmobile gas valves, pistons and other parts.

  3. #3

    cylinders

    yes i have one stock 900 cylinder and piston and head and two
    1050 (700) cylinders pistons and heads. it like a 1000cc i figure. ( i did put the 900 cylinder one the pto end so i find a cheap 1050 cylinder it will be ez to change. my friends call it the SL HOOPTY RIDE

    I was looking at a dyno sheat of a 785 pro and it torque and hp is really close to a fugi xcr 800 triple engine.

    my thought is.... from what i have seen the 785 engine is closer to snowmobile porting and timming then any other jet ski engine... and it runs like a raped ape. so why not build a 1050 with ex valves (sled cylinders) and have a 2 stroke that will eat the 4strokes for lunch, and do it on pump gas.

    and i just happen to have 2 2004 polaris 700 sled cylinders with evs

  4. #4

    Join Date
    Jun 2008
    Location
    Bullhead City AZ.
    Posts
    451
    +1
    2
    WOW

  5. #5

    porting

    I did find some posts on sled cylinders on jetskis and i looks like two or three guys keep saying the port timing is to hot (to high).


    some mod jet ski motors only make 35-40hp at 3,500rpm

    A 1050 snowmobile engine makes 57 hp @ 4,200 rpm (as low as the dyno went) http://www.snowestonline.com/forum/s...highlight=1050

    and it ended at 249 hp

  6. #6

    Join Date
    Sep 2006
    Location
    topeka,ks
    Posts
    3,332
    match 3 clys on the same part number

  7. #7
    Connecticut CrazyA's Avatar
    Join Date
    Nov 2005
    Location
    CT.
    Posts
    8,141
    +1
    1,052
    Quote Originally Posted by brent9k View Post
    I did find some posts on sled cylinders on jetskis and i looks like two or three guys keep saying the port timing is to hot (to high).


    some mod jet ski motors only make 35-40hp at 3,500rpm

    A 1050 snowmobile engine makes 57 hp @ 4,200 rpm (as low as the dyno went) http://www.snowestonline.com/forum/s...highlight=1050

    and it ended at 249 hp
    Yup, and because of clutching engagement, a sled has the advantage of coming in wherever you want to set it.

    Imagine an upper rpm band ported sled that had to start pulling at 1,500 rpm....

    I can't read that link cause I'm not a member, but I would imagine that the 1050 sled motor you speak of doesn't engage until 4,000rpm, give or take.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Need help on wave venture 700 regarding compression...please read....
    By dontknowcrap in forum Yamaha Old School Skis
    Replies: 10
    Last Post: 07-03-2014, 12:32 PM
  2. Introducing myself and NEED HELP on SPX!!
    By SEADUDE21 in forum Sea Doo Open Discussion
    Replies: 3
    Last Post: 09-03-2011, 11:07 AM
  3. Replies: 0
    Last Post: 07-31-2011, 08:38 AM
  4. need help on a SLT 700 Polaris
    By slt in forum Polaris Open Discussion
    Replies: 2
    Last Post: 06-05-2009, 12:12 AM
  5. Need help. (2)1.00 os piston cylinder and (1) std piston cylinder
    By 750slt in forum Polaris Open Discussion
    Replies: 3
    Last Post: 05-27-2009, 05:30 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
  •