ZG222 Compression specs

[leeton31]

G'day all,
Can anyone explain to me the huge differences in the compression specifications as printed in the Kubota Service Manual for the ZG222.
See image below.
Number 1 cylinder 173 psi
Number 2 cylinder 52 psi.
Thanks

 

[ILENGINE]

Compression release on cylinder 2 only possibly

 

[StarTech]

What you got is an automatic decompression system that is activating the #2 Exhaust valve.

Read PDF page 65 (1-M3 manual page)

 

[leeton31]

Thanks for that, either my automatic decompression is not working or is not on this motor, as I did a comp test and it showed 150psi on cylinder 2, I will do some more research.
Appreciate your help!