Results 1 to 6 of 6
  1. #1

    1996 Polaris SLX780 compression

    We had the 780 out on the water last weekend and ran it out of gas. About 15 minutes after filling it back up it had a loss of power and the motor sounded a little different. Took it back to the garage and did a compression check. Front Cylinder: 150psi, Center 150psi,
    Back 140psi. The water/gas float was sitting on the bottom of bowl, and the plugs seemed fine. Should i be concerned with the compression difference? What should i check next?
    I bought this ski new in 1996 and never did any work to it beside greasing the bearing.

  2. #2
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    42,307
    +1
    2,142
    When you removed the gas cap after running out of fuel, was there a major vacuum present in the fuel tank?

    How old are the spark plugs?

    Twenty one years without servicing is a long time. The problem with reduced engine power may or may not have anything to do with running out of fuel while riding. Could be a coincidence.

  3. #3
    Quote Originally Posted by K447 View Post
    When you removed the gas cap after running out of fuel, was there a major vacuum present in the fuel tank?

    How old are the spark plugs?

    Twenty one years without servicing is a long time. The problem with reduced engine power may or may not have anything to do with running out of fuel while riding. Could be a coincidence.
    it's always under vacuum when i open the gas cap. Don't remember the last time i changed the plugs.


  4. #4
    I was thinking of doing the oil delete, and changing the gas lines this winter.

  5. #5
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    42,307
    +1
    2,142
    Quote Originally Posted by northman View Post
    I was thinking of doing the oil delete, and changing the gas lines this winter.
    Does this engine still have the original gray Tempo fuel hoses?

    Why switch to pre-mixed oil in the gasoline? That will roughly double your oil consumption per tank of fuel.

    Have you read through the recommended maintenance and upgrades for the blue Fuji engines? Your engine should already have the upgraded fuel pump, I think.

  6. #6

    Join Date
    Aug 2016
    Location
    Panama city
    Posts
    316
    +1
    23
    The only thing that has slowed my 96 slx down, was when the shaft seal bearing started binding last year...An yes, I bought it new also....

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. WTB a crankshaft for a 1996 Polaris Slx780
    By tzrtony in forum Polaris Projects
    Replies: 2
    Last Post: 06-27-2012, 07:01 PM
  2. 1996 Polaris SLX780 is riding low in the water
    By dhart in forum Polaris PWC Performance
    Replies: 7
    Last Post: 09-08-2010, 05:36 PM
  3. 1996 polaris slx780 no compression 1 cylinder
    By polarisman in forum Polaris How To & FAQs
    Replies: 1
    Last Post: 07-09-2010, 02:08 PM
  4. 1996 polaris slx780 drive system
    By polarisman in forum Polaris How To & FAQs
    Replies: 10
    Last Post: 11-13-2009, 09:39 AM
  5. Newbie needs help! 1996 Polaris SLT
    By cfish2169 in forum Polaris Open Discussion
    Replies: 6
    Last Post: 04-18-2007, 09:46 AM

Posting Permissions

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