08-04-2011, 07:22 AM #1
85,85,55 gp1200 w/low compression
Low compression after all. I tested starting with front of Hull 85,85,55. The last one is the one we thought was bad so my question is can I get away with pulling head and cylinder and do a top end or do I need to perform some more testing?
08-04-2011, 08:17 AM #2
How many hours on the motor?
Did you use a good compression gauge and tested the motor warm at WOT?
If low hours I guess you could get away with doing just a top end, need to pull the head and look further. I'm sure some with more experience will chime in. Those numbers are low though
08-04-2011, 08:38 AM #3
Motor not warm and kinda older gauge that u hold on not threaded. I checked it because it is bogged at idle and so I thought to check there. I think its around 200 hrs
08-04-2011, 11:41 AM #4
08-04-2011, 12:35 PM #5
I would wait for a reply from the more experienced people on this forum.
08-04-2011, 01:04 PM #6
67x stamped on top the head is that still the same as the 66v or totally different?
08-04-2011, 07:55 PM #7
- Join Date
- Aug 2008
compression #s are low, but the fact that one is way lower than the rest indicates a bad piston/ cylinder. A cold motor should still show at least 100psi across the board. 200 hours is a good run for these engines, I have had 3 of these skis since 1998 and never had an engine last more than 60 hours before a piston melts for some reason.
08-04-2011, 08:46 PM #8
Sounds like time for a rebuild to me.
# 3 squeaked a piston or something. Rebuild the carbs as well.
08-04-2011, 09:48 PM #9
08-05-2011, 12:51 PM #10
- Join Date
- Jan 2006
- Texas City, Texas
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By thomasdjames1 in forum 2-Stroke PerformanceReplies: 4Last Post: 09-10-2010, 12:50 PM
By TheXrider in forum 4-Tec PerformanceReplies: 25Last Post: 11-09-2009, 01:53 PM
By eye4speed in forum Polaris How To & FAQsReplies: 3Last Post: 06-03-2008, 09:42 PM
By jmule98 in forum Polaris How To & FAQsReplies: 1Last Post: 09-17-2007, 09:33 AM
By jason3814 in forum Polaris Open DiscussionReplies: 8Last Post: 08-06-2007, 10:25 PM