Page 1 of 2 1 2 LastLast
Results 1 to 10 of 12
  1. #1

    Top End Rebuild Compression Issues (02 GP1200R)

    Just got my cylinders back from Millennium Technologies and some Pro-X Pistons to match. I ran a compression check and it was 125 across the board. I Figured I would run some flush water to check my idle settings before break in the morning for about 5 mins.

    I DID RUN THE ENGINE BEFOR ATTACHING THE WATER & DISCONECTED IT BEFOR TURNING THE ENGINE OFF

    I checked the compression after I did that and starting from the Cylinder from the battery box I got
    113, 123 and 125

    Plugs all looked the same. Little slashes of oil on them.

    Any ideas? Should I still continue with breaking it in, in the morning?





    2002 GP1200R, Pre-mix with Amsoil Interceptor, Riva Free Flow and Stinger 3 Exhaust, R&D Filter Box


  2. #2

    Join Date
    Apr 2010
    Location
    Greenville, NC
    Posts
    281
    +1
    4
    If i remember correctly you need to break it in before you will get a true compression reading. Since the rings are not seated yet.

  3. #3
    I hope so man. It would suck to have to get the cylinders re-plated or new pistons rings and gaskets. Thanks for the reply! Anyone else have any input?

  4. #4
    Happily Self-Employed WFO's Avatar
    Join Date
    Nov 2005
    Location
    Houston, Texas
    Posts
    12,800
    +1
    449
    .

  5. #5
    Happily Self-Employed WFO's Avatar
    Join Date
    Nov 2005
    Location
    Houston, Texas
    Posts
    12,800
    +1
    449
    Quote Originally Posted by 992door View Post
    you need to break it in before you will get a true compression reading. Since the rings are not seated yet.
    +1

  6. #6
    Thanks WFO! I guess I will be hitting the lake in the morning! Thanks again guys!

  7. #7

    Join Date
    Jan 2006
    Location
    Texas City, Texas
    Posts
    1,249
    +1
    15
    Quote Originally Posted by 992door View Post
    If i remember correctly you need to break it in before you will get a true compression reading. Since the rings are not seated yet.

    And it may take a few hours before it does break in. That nicasil is tough.

  8. #8
    2 hours of breaking in yesterday. I checked the compression this morning. Starting from the rear of the ski I got 120, 125 and 127. I will do some more breaking in and post the results. Thanks Again Guys

  9. #9
    6 hours on engine since rebuild and the compression is 125, 125 and 123



    Thanks again guys!

  10. #10
    WATER WOODY's Avatar
    Join Date
    Aug 2005
    Location
    Minden, Nevada, United States
    Posts
    10,664
    +1
    11
    Lookin good!

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 00 gp1200r top end rebuild
    By WillieD in forum Yamaha Old School Skis
    Replies: 6
    Last Post: 09-04-2016, 09:52 AM
  2. 95 Kawi sc lost compression after new SBT top end rebuild
    By Tipsy in forum Kawasaki PWC Performance (2-stroke)
    Replies: 6
    Last Post: 08-10-2016, 12:03 PM
  3. Top End Rebuild - compression ring seating question
    By polaris780slt in forum Polaris Open Discussion
    Replies: 15
    Last Post: 08-14-2012, 07:00 PM
  4. '96 SL780 top end rebuild
    By repoman in forum Polaris Open Discussion
    Replies: 7
    Last Post: 04-08-2007, 09:47 PM
  5. RXDI top end rebuild
    By bow tie klr in forum Sea Doo Open Discussion
    Replies: 0
    Last Post: 08-04-2005, 08:02 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
  •