Compression Test

by **pleaseletitsnow** » November 2nd, 2004, 4:20 am

what is the correct way to test the compression and what should my 00 700xcsp be at thanks

by **Xtreme XC** » November 2nd, 2004, 4:33 am

1. Pull plugs
2. screw compression gauge in cylinder, when finger tight pull motor over 5-6 times
3. Repeat with same amount of pulls for the opposite cylinder

A 7 hundo Poo should show around 125-130 psi give or take a couple.

by **Mainecat** » November 2nd, 2004, 4:38 am

They both should be the same psi and the engine should be COLD!!

by **catdaddy** » November 2nd, 2004, 4:49 am

With throttle completly wide open.

by **treewhacker** » November 2nd, 2004, 5:09 am

A 7 hundo Poo should show around 125-130 psi give or take a couple.
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At sea level, compression less at higher alt

by **pleaseletitsnow** » November 2nd, 2004, 5:12 am

Thanks fellas i appreciate it

by **Xtreme XC** » November 2nd, 2004, 5:42 am

Keep in mind going one gauge to the next will vary in readings. No 2 gauges seem to be the same. You just want to see the same reading between both cylinders (withing a couple psi). Holding the throttle open will not change your reading vs closed.

by **RWL** » November 2nd, 2004, 5:49 am

Ask any rev owner....most are expert's at this! (OUCH):B

by **Johnny Skeptical** » November 2nd, 2004, 11:43 am

uhhhh 'puddin' head' that is incorrect an engine should be warm so the rings are seated properly---even a leak down should be done while warm.
And that is correct about not holding the throttle open but it will reach the peak quicker if you do....within 10% between the 2 cylinders is acceptable.

by **treewhacker** » November 2nd, 2004, 1:13 pm

Throttle should be held open.....With throttles closed you will pull more pulls to get to 100#, plus with them closed you may get innacurate readings should one slide be open just a little more.