Re: CD-11’s compression issue

[Don]

Skanders
It sounds like you are just changing the gage, but still using the same hose/valve/threaded adapter, am I correct? If so, you really need to swap out the entire setup. There may be problems due to a long hose, leaky valve or threaded adapter. Like all have said, 60PSI is way low for a 40hp, so this would back up our gage problem theory.
OK, you used a ball hone, so I am doubting you took too much meat off the cylinders, but it is possible. You say you didn’t rebuild all the powerheads, do the ones that were untouched run? If so, do they start and run OK? If so, then this would also back up our gage problem theory, these engines aren’t going to start or run well at all with only 30PSI.