What range of compression is good?

**Sun Dec 17, 2006 8:45 am » Post: #1 » Download Post**

I just did a compression test on my mc21 and got about 128 and 130 PSI in each cylinder. Just wondering how good a result is this?

**Sun Dec 17, 2006 10:34 am » Post: #2 » Download Post**

Excellent.
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**Mon Dec 18, 2006 8:47 am » Post: #3 » Download Post**

Thanks! So at what PSI rating would you say compression is not so good?

**Thu Dec 21, 2006 12:21 pm » Post: #4 » Download Post**

Less than 100, or a difference of more than 10.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball