manifold pressure

[Bandit 153]

My owners manual is silent on operating limits (other than green arc readings). However the 0-2 Dash 1 says to check them at 1800 RPM and the front and rear should be within a couple of inches hg. It also says that anything greater should be investigated as it could be a clogged fuel nozzle or a cold cylinder.
First, does the O-2 Dash 1 limits seem reasonable for a 74G/IO360G? Second, Anyone have any better limits? Third, if you find your out of limits what needs investigating. Just did a compression check and both engines/all cylinders are getting fuel and they are not cold.

[stackj]

Look for cracks (leaks) in the manifold pressure lines going to the engine indicating the highest MP at any given RPM.

I had high pressure readings on my front engine for a very long time. When we finally found the problem, it was a split nut on one of the lines connecting to a fitting going through the firewall.