Compression Yamaha 70 HP

[Melbournite]

Did a compression test on Yamaha 70 HP 2 stroke 1997. Got a reading of 117, 115 and 110 just wondering if this seems okay. Test was done both while engine was cold and then when it was warm and the readings were very similar.

 

[robert graham]

Rule of thumb is each cylinder should be within 10% of the others....so yours sounds fine. Some folks will do a de-carb with Ringfree or similar carbon remover to clean the rings and then run the test again...but like I said, your readings seem fine to me...

 

[Melbournite]

Thanks Robert, thought they were okay but needed to check