Results 1 to 9 of 9
  1. #1
    TX21's Avatar
    Join Date
    May 2007
    Location
    North Texas
    Posts
    988
    +1
    7

    GP1200R crank seals not holding 10 psi

    I just installed these crank seals per the riva write up grease and all and won't hold anything over 8 psi. Some have said to pressure test your motor to 10 psi but I think the book says 8 psi. Sould I just test it at 8 and if it holds 10 minutes then run it? I really don't know what to do at this point. Crank is new from last season with about 20 hours on it. I want to never have to pull this motor again so I want it to be right.


  2. #2
    WATER WOODY's Avatar
    Join Date
    Aug 2005
    Location
    Minden, Nevada, United States
    Posts
    10,664
    +1
    11
    Did you spray the motor down with soap/water to determine the leaks?

  3. #3
    TX21's Avatar
    Join Date
    May 2007
    Location
    North Texas
    Posts
    988
    +1
    7
    yup, its the rear crank seal. Before I changed it it would not hold anything over 5 so I pulled the motor and put new crank seals in. I can even push on the lip of the seal by the crank and it will leak a bit more.

  4. #4
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    Location
    League City, Texas
    Posts
    16,066
    +1
    23
    spray it down, and rotate the crank to see if the leak follows the crank. if so, there could be a bad surface on the crank.

  5. #5
    Superman! fivespeedsteed's Avatar
    Join Date
    May 2010
    Location
    Midlothian VA
    Posts
    1,058
    +1
    14
    yeah might be a groove on the crank. try above advice

  6. #6
    TX21's Avatar
    Join Date
    May 2007
    Location
    North Texas
    Posts
    988
    +1
    7
    Good call, I'll give it a go tonight.

  7. #7
    TX21's Avatar
    Join Date
    May 2007
    Location
    North Texas
    Posts
    988
    +1
    7
    I filled it again and it seems to move with the crank sometimes and sometimes not. It did hold 8 psi for 9 minutes with zero drop so I guess it dosen't matter. I did find a leak on the exhaust manifold that only leaks out the water jacket not into the cylinder. Hope I can score a used manifold from WFO for cheapskis. Just another park I need. Still have yet to ride my ski this season

  8. #8
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,929
    +1
    1,407
    IMO 8 for 9 is good to go..

  9. #9
    TX21's Avatar
    Join Date
    May 2007
    Location
    North Texas
    Posts
    988
    +1
    7
    Yeah thats good news! Just wont go past 9 psi for some reason. Now all I gota do is get me a manifold that is not ate up like mine and drop it back in the hull.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Crank seals GP1200R
    By TX21 in forum Yamaha How To & FAQs
    Replies: 11
    Last Post: 08-16-2010, 10:27 PM
  2. $90 for crank seals?????
    By xlint89 in forum Polaris Open Discussion
    Replies: 6
    Last Post: 06-26-2007, 12:44 AM
  3. Crank seal question SLT780
    By Tony in forum Polaris Open Discussion
    Replies: 12
    Last Post: 06-16-2007, 12:50 AM
  4. ? About Greasing Crank Seals!!!!!!!!!
    By jeff007 in forum Yamaha PWC Performance (2-stroke)
    Replies: 2
    Last Post: 06-03-2007, 09:22 PM
  5. crank seals
    By John in forum Yamaha PWC Performance (2-stroke)
    Replies: 10
    Last Post: 01-28-2006, 01:38 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
  •