Results 1 to 4 of 4
  1. #1
    99searay's Avatar
    Join Date
    Jul 2011
    Charleston, SC

    Help Diagnose Root Cause

    Ok I have a 2000 GPR 1200 which I picked up at the beginning of the summer. Well I ran into issue the past week and have no compression in my my middle cylinder (other 2 are good). I spend a lot of time on PWCTODAY but saw a lot of references to this site for help with GPR issues. I was looking for some expert opinions as to the root cause of my failure. I am not sure if the following pictures can paint a good story but I figured I would post them and see what advice I get. All three plugs look the same and if anything look more rich than lean. To me the pistons don't appear to indicate a lean condition either (but I am far from an expert). Thanks in advance for any assistance.

  2. #2
    Well, for starters, you're running lean. Do a search on piston wash to get a better idea. Secondly, you have an 800cc piston in there (66E). The E denotes the 800cc version and V denotes the 1200cc version. Someone has clearly had it apart and fixed it incorrectly. I found the same thing in my ski after it burnt up after a few runs. I'm not sure what the difference is between the two pistons, but I do know the 800cc has different port timing.

  3. #3
    Sometimes the rings can catch the exhaust ports which may have happened here. My incorrect piston caused damage in the same area as yours.

  4. #4
    99searay's Avatar
    Join Date
    Jul 2011
    Charleston, SC
    Thanks millertyme26...this is the exact advice I was hoping to receive. The center cylinder is definitely different from the other two which appear to have a sleeve. I was thinking the other two had been repaired vice the center one. I will search on piston wash to better educate myself.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. I Need Help Diagnosing A Problem..
    By mikefeliz7 in forum 2-Stroke Performance
    Replies: 22
    Last Post: 02-17-2009, 06:29 PM
  2. Need Help diagnosing problem
    By Sirhc7897 in forum 4-Tec Performance
    Replies: 8
    Last Post: 08-25-2008, 09:47 AM
  3. New and need help diagnosing my '08 rxtx
    By dr_hunt in forum 4-Tec Performance
    Replies: 50
    Last Post: 06-28-2008, 06:16 AM
  4. Think i found root cause for my lean piston
    By xplayer2885 in forum Polaris Open Discussion
    Replies: 4
    Last Post: 11-14-2007, 10:04 AM
  5. Help diagnosing a grinding noise? Z
    By ZMANN in forum Polaris Open Discussion
    Replies: 12
    Last Post: 10-10-2006, 11:02 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