Thread: 1200 GP Erratic compression
03-03-2011, 08:36 PM #1
- Join Date
- Dec 2008
1200 GP Erratic compression
I have a 2002 Gp 1200 with 72 hrs. I just got it but it has been sitting for a couple of years.
When I first took compression numbers they were 120,120,120. I put fresh gas in it and when it fired I shut it off. The compression numbers were then 120,60,120.
I turned it over with the plugs out and got the center compression to 120. I ran it for a couple of seconds and checked it again, it was 120. I did this several times and did get the 60 number 1 other time.
Could this be a clogged reed valve or something?
03-03-2011, 08:54 PM #2
03-04-2011, 06:22 AM #3
- Join Date
- Jul 2008
- cape cod
make sure you are using a good comp gauge, cheap gauges do not give consistant readings, snapon & mac tool have good ones
03-04-2011, 09:45 AM #4
Make sure the oring on the gauge is sealing like it should. If you tighten too much the o-ring will get deformed and if it's not tight enough it will not seal.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By BlitzK in forum Yamaha PWC Performance (2-stroke)Replies: 1Last Post: 08-01-2008, 12:03 PM
By corporal17 in forum Polaris Open DiscussionReplies: 0Last Post: 06-29-2008, 07:14 PM
By ph2ocraft in forum Polaris Open DiscussionReplies: 2Last Post: 06-23-2008, 05:57 PM
By baumer33 in forum Yamaha How To & FAQsReplies: 1Last Post: 04-24-2008, 03:06 PM
By Hydrotherapy in forum Yamaha PWC Performance (2-stroke)Replies: 9Last Post: 06-12-2007, 12:58 PM