BF 150 Compression Issue

[PaulBF150]

In troubleshooting overheating in exhaust I broke down engine and removed the head, prior in doing so I did a compression test with these resuts (1- 140, 2 -125, 3-125, 4-130).
Pulled head to clean water jacket and water passanges in the head. Cleaned all surfaces for new head gasket and proceeded to reassemble. Torqued everyone to these spec's. Proceeded with aligning timing chain and intake and exhaust cams, all set.
Today did a compression test again and this is where someone can shoot me! No compression in cylinder 1 & 4. Rechecked timing and valve clearances, all good. Still nothing. Loosened both intake and exhaust valves on these cylinders to ensure they were closed. Blowing air into spark plug hole can hear air existing into the exhaust and both cylinders.
So for the question of the day, where did my compression go??
Paul

 

[PaulBF150]

Just some additional info for anyone that cares.
Well found the culprit, bent exhaust valves. Not sure how I had compression before disassembly and once assembled they were bent. I should looked at them when head was off, but with 140 psi compression they were not even thought about.
I should of learned from last year when doing the same, found cylinder one had bent exhaust valves after reassembly.
Also I enjoy breaking down the engine at least twice.
Hey I'm 70 yrs old, so I should have some degree of forgiveness.

 

[jgmo]

You are ALWAYS forgiven when you do multiple surgeries on your own iron ;>)

 

[racerone]

Did you install the head and turn the engine before lining up the timing marks?

 

[Alan Hicks]

I think there's a pretty good chance YOU bent the valves in the process of lining up the marks....

 

[PaulBF150]

Guys sorry for late reply, my head was in the engine.

Just FYI, timing was done manually (turning crank with wrench). Anyway, engine has 4 new exhaust valves lapped in and engine back together and it runs

 

[Letalis]

I have a question here. Is there a way to adjust the timing on these Honda outboards? I have a BF90a and want to check/adjust the timing

 

[PaulBF150]

These days everything is controller by computer, so I am not aware of anything that can be adjusted. I would recommend posting a new Thread with you question. this will allow the real experts to comment.