ontario sledder
Member
so I did a compression test on my 03 Yamaha viper, here are the numbers from left to right when sitting on the sled 120 136 140. are these usual numbers? cold engine and wasn't pressing the throttle. thanks
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The pto has lower compression they say %10 but not sure. Looks good to me.
super1c
Super Moderator
Just fine. PTO always lower
Srx007
Member
OK so when doing a compression test Always hold the throttle Wide open. your first 3 pulls are usually the most significant while building compression. Total of 5 pulls to obtain full compression. These numbers are off. they should be with-in 5 lbs of each other. Check again while holding throttle wide open then pour a small amount of 2 stroke mixing oil (about a shot glass full into each cylinder) and record difference. If there is any blow by past the piston rings the oil will seal the gap. Remember to record the dry cylinder vs wet (oiled) cyl. Check compression while cold. Enjoy!!
staggs65
Moderator
SRX007 vipers do not have the same compression on all cylinders. PTO has lower compression instead of staggered jetting. Numbers are fine.
super1c
Super Moderator
X2 with staggs
Hey guys im new to this site .trying to get some answers. I did a compression on my sled 2002 yamaha sx viper 700 and on the PTO side i got 70psi then middle 100 then MAG 105. The sled is also overheating.Should i be pulling the head off to inspect head gasket and pistons?
Thats a big difference! You should start your own thread. yes further inspection required.
Youllbe2nd
New member
Youllbe2nd
New member
X3 staggs
Sent from my E6560C using Tapatalk
Sent from my E6560C using Tapatalk
how do i start my own thread?
pretty sure its x4 me
drew24
New member
There is a link at the top left corner that says post new thread. It will be right above where it says srx/viper.