Compression Question
05-16-2020, 01:30 PM
#1
Junior Member
Squid
Thread Starter
Join Date: Mar 2005
Location: Fremont, California
Posts: 22
Compression Question
Hello all, I have a question on compression. I have my carbs and valve covers off and decided to do a compression check.
Both cylinders are at 120, not sure if I should do something different. The number is even on both but shouldn't it be higher?
Both cylinders are at 120, not sure if I should do something different. The number is even on both but shouldn't it be higher?
05-17-2020, 01:13 PM
#2
Senior Member
SuperSport
Join Date: Jul 2018
Posts: 565
Yes indeed, a lot more than 120 would be good. I'll have to refer to the manual when I get a sec, but definitely higher than that. Could be a lot of reasons but the easy quick test is to add some oil to the cylinder then retest. If you have normal compression with a cap full of oil, you likely need a bore/hone/rings. Make sure you have the throttle wide open when cranking.
AV
AV
05-17-2020, 03:01 PM
#3
Senior Member
Superstock
Join Date: Jul 2018
Location: Champaign, IL
Posts: 277
I don't recall that I've ever had 2 identical compression readings on an engine, even a fresh rebuild. I might suggest that you use a different gauge and run it again. Most automotive places, AutoZone, etc loan them out for free. Not saying that they are the most accurate, but.
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