Compression rate for 40hp motor

[alasanii]

Hi everyone,
I,m again for 40 hp 2 stroke 3 cyl Yamaha.
I replaced all rings and checked compression ,it is 120 psi

What you think 120 is OK or to be more ?

Thank you in advance

[rodbolt17]

120, as long as all three are at 120, is fine.
I prefer leakdown tests over compression tests.

[alasanii]

Thank you for info.

Please advise hoe can I do leak test ?

Thanks

[robert graham]

120 lbs. on each cylinder seems fine, but why did you replace the rings? Have you run the motor enough to seat the new rings in the cylinders? If you're at 120 lbs. now, then the readings may get even higher after new rings get seated. Good Luck!

[robert graham]

Also, with new rings you need to follow break-in procedure/double oil, slow RPM's, etc.

[alasanii]

Good and usefull news from you,I,m waiting further response
Why do I changed ring ? for nothing ,it was mistakenly recommended from local
mechanic,real problem was only carburetor ....
Break in procedure I know I,m using double oil but to follow low RPM is difficult .Sometimes I,m running at high speed .Already I burnt 2 can of gas (about 50 liter )
why is 120 PSI I do not know,I test is when engine was cold and with closed throttle.Maybe it will be higher when engine will be warm (hot) and full open throttle ?
Also I changed both bearings,oil seals and plugs.

Please advise what can I do,and why 120 PSI on each cylinders ?
All old removed rings I have in place (they are same as new)

Please advise,
Thank you