So this is a broader thread due to my lack of knowledge with Outboards, my stubbornness with not taking this to a shop, and the plethora of issues I am trying to resolve.
I grew up with boats but never owned one myself. I am pretty familiar with the mechanics of cars, but boat life is new to me. I bought a 98 Sunbird 170 about a month with this 90HP on it. It runs but has rough idle and stalls randomly. Have been tearing it apart and have found many issues that I am slowly fixing but always seem to find a new culprit to the problems.
Issues:
Cracked primer valve (replaced)
- used the repair/rebuild kits for the primer valve and the fuel pump while I was at it.
Sticky kill switch (replaced)
Broken corroded spark plug wire (all replaced)
- Spark on all plugs
Thinking carbs and timing have to be adjusted (nothing done yet)
Bad/low compression? (Reading 62/30/64/60 cold)
so obviously what I am troubleshooting now is the compression. Some info below:
- lowest compression is the same cylinder that had the corroded spark plug wire.
- the same spark plug hole is a little beat up, maybe had been cross threaded at some time (but didn’t see any bubbles when using soapy water around the tester)
Questions:
What should I check next?
Is ~60psi good for this engine cold?
Read some things about testing WOT, is this just checking compression with the throttle in the forward most position?
Thanks in advance.
I grew up with boats but never owned one myself. I am pretty familiar with the mechanics of cars, but boat life is new to me. I bought a 98 Sunbird 170 about a month with this 90HP on it. It runs but has rough idle and stalls randomly. Have been tearing it apart and have found many issues that I am slowly fixing but always seem to find a new culprit to the problems.
Issues:
Cracked primer valve (replaced)
- used the repair/rebuild kits for the primer valve and the fuel pump while I was at it.
Sticky kill switch (replaced)
Broken corroded spark plug wire (all replaced)
- Spark on all plugs
Thinking carbs and timing have to be adjusted (nothing done yet)
Bad/low compression? (Reading 62/30/64/60 cold)
so obviously what I am troubleshooting now is the compression. Some info below:
- lowest compression is the same cylinder that had the corroded spark plug wire.
- the same spark plug hole is a little beat up, maybe had been cross threaded at some time (but didn’t see any bubbles when using soapy water around the tester)
Questions:
What should I check next?
Is ~60psi good for this engine cold?
Read some things about testing WOT, is this just checking compression with the throttle in the forward most position?
Thanks in advance.