Results 1 to 8 of 8
  1. #1
    work hard..play harder! gruba's Avatar
    Join Date
    Feb 2009
    Location
    horseheads, ny
    Posts
    44

    cylinder base nuts

    ski quit after running rough...took seat off and engine compartment was filled with exhaust. I discovered that one cylinder base nut had vibrated off and another was very loose. First question...If the gasket is intact should I loosen the others and tighten in sequence or can I just tighten them down? Second question....is this unusual, and should I be looking fora source of excessive vibration? The ski has been running great with no apparent issues. 96 sl780.


  2. #2
    seaobin's Avatar
    Join Date
    Jun 2007
    Location
    Raleigh, North Carolina, United States
    Posts
    1,573
    +1
    1
    pull the exhaust, remove the cylinder, check the gasket, if torn at all, replace gasket. Reseat the cylinder, 2 drops locktite red/blue, torque correctly, reattach the exhaust, replacing gaskets as needed or copper spraying gaskets in good condition

  3. #3
    ryandi2's Avatar
    Join Date
    Aug 2009
    Location
    conesus ny!
    Posts
    2,092
    +1
    19
    you should take the cyl off and make sure tehgasketis not chewed up.. then torque them down the right way..

    as far as removing the exaust, i know on my 1050 i did not have to remove it. and im pretty sure you can get away with the same thing.

  4. #4
    seaobin's Avatar
    Join Date
    Jun 2007
    Location
    Raleigh, North Carolina, United States
    Posts
    1,573
    +1
    1
    how do you pull the cylinder without removing the exhaust? They are bolted together.

  5. #5
    ryandi2's Avatar
    Join Date
    Aug 2009
    Location
    conesus ny!
    Posts
    2,092
    +1
    19
    unbolt the exhaust from that cylinder only.. i did not have to take it out of the boat.. i was just replacing one cylinder/piston

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
    Join Date
    Oct 2006
    Location
    Cleveland OH
    Posts
    17,330
    +1
    31
    Quote Originally Posted by gruba View Post
    ski quit after running rough...took seat off and engine compartment was filled with exhaust. I discovered that one cylinder base nut had vibrated off and another was very loose. First question...If the gasket is intact should I loosen the others and tighten in sequence or can I just tighten them down? Second question....is this unusual, and should I be looking fora source of excessive vibration? The ski has been running great with no apparent issues. 96 sl780.
    Yes it's unusual.

    There should've been Blue Loctite used on the fasteners to prevent them from loosening.


    You're going to have to inspect the base gasket for damage. I'm pretty sure it'll be bad though.

    You can get a Cometic top end gasket kit for round $60 that should have everything you'll need gasket wise.

  7. #7
    work hard..play harder! gruba's Avatar
    Join Date
    Feb 2009
    Location
    horseheads, ny
    Posts
    44
    pulled cylinder and replaced gasket and applied loctite to all nuts and bolts, gasket was blown out badly....still haven't figured out what cuased this to happen, I will watch closely. Thanks for the input, again!

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
    Join Date
    Oct 2006
    Location
    Cleveland OH
    Posts
    17,330
    +1
    31
    Normally guys don't know about putting the exh manifold on before torquing the base nuts down. If you don't, when you put the exh manifold on, it will pull the cyls "in line" and damage the base gasket.

    So lightly torque the manifold on the cyls first. Torque the base nuts, and then install the manifold gasket and rest of the engine.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Cylinder Base Nuts
    By hyoctane23 in forum Polaris Open Discussion
    Replies: 18
    Last Post: 08-29-2016, 08:38 AM
  2. Replies: 2
    Last Post: 06-14-2012, 10:24 PM
  3. Watcon Cylinder Base Nut Tool
    By Koodat in forum MSX/Matrix
    Replies: 1
    Last Post: 06-14-2012, 06:38 PM
  4. cylinder base nuts
    By pslt780 in forum Polaris Open Discussion
    Replies: 18
    Last Post: 02-14-2010, 02:05 PM
  5. 93 sl750 cylinder base gasket?
    By wreckmaster in forum Polaris How To & FAQs
    Replies: 34
    Last Post: 05-16-2008, 03:12 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
  •