Thread: Compression test
02-29-2008, 05:24 PM #1
- Join Date
- Sep 2007
Ive made a comp test and only get 100psi on all pistons!?
Is that bad ?
Maybe it depends on the gauge?
Its no difference between the 3 cylinders... same number for all.. 100psi
Have around 80hours on the ski...
Yamaha gp1200r -02
02-29-2008, 05:30 PM #2
thats not good. do you have aftermarket heads? all three are same thats good and i could be wrong but your gauge maybe wrong. those are low numbers
02-29-2008, 05:35 PM #3
What guage you using? A cheap guage can give false readings.Whats your elevation?Stock heads or aftermarket?
02-29-2008, 05:46 PM #4
Id say the gauge is inacurate all 3 cylinders are the same I wouldnt worry bout it! Sounds like its in good shape.
02-29-2008, 06:00 PM #5
get a better gauge and make damn sure before you go out.... just because there the same in readings doesnt mean its all good, could be all 3 sets of rings are jacked evenly.
02-29-2008, 07:49 PM #6
HOw are you doing the test ? Are you holding the throttle open ? Is the battery good and charged ?
If you are getting the same for all three there is hope.
02-29-2008, 07:59 PM #7
Do a compression test on another engine in an A.T.V. or something (2 stroke) that you know is good and see what your gauge reads. get someone else's gauge for a second comparison. i check mine once in awhile on a new motor after break in as i know what the motor should read and that tells me if my gauge is still reading accurately.
02-29-2008, 08:41 PM #8
02-29-2008, 11:37 PM #9
03-01-2008, 05:14 AM #10
- Join Date
- Sep 2007
The throttle is not open.. iam going to check the battery.
Head is stock... everything is stock=)
The gauge was pretty cheap.. only 30$
I will test it for another ski this week... that is in good shape
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