Carb(fuel flow?) issues with Honda 7.5 outboard - SailNet Community
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post #1 of 16 Old 06-18-2012 Thread Starter
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Carb(fuel flow?) issues with Honda 7.5 outboard

I have a Honda 7.5hp outboard on my sailboat that is acting up. I can get it to fire with the throttle and choke open, but have to push the throttle in halfway and leave the throttle open for it to stay running. It will not idle at all anymore. I am thinking there is a restriction in fuel flow somewhere, probably in the carb. I have heard that Honda's can be weird to work on, but I want to give it a shot myself before shelling out the big bucks to get it fixed. Are there any suggestions on where or start and/or resources (websites, books, parts dealers, etc) you can point me at to address the problem?
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Re: Carb(fuel flow?) issues with Honda 7.5 outboard

Your problem sounds exactly like what I experienced with the exact same engine. I emptied my gas tank and let it dry out inside, filled it with fresh gasoline and it now runs like a top.
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post #3 of 16 Old 06-18-2012
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Re: Carb(fuel flow?) issues with Honda 7.5 outboard

If it were me, I'd start by pulling the carb off, dropping the bowl then the float and needle valve then I'd spray some carb cleaner and blow the heck out of it with compressed air and put it back together. A good many times, that will clear a piece of crap that got stuck in the low speed circuit. If it doesn't work, then it's more work and more troubleshooting, but you have to start somewhere and may as well try the easy stuff first.

edit: What Whorne said even sounds easier.

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Re: Carb(fuel flow?) issues with Honda 7.5 outboard

I always disconnect the tank after use. The gasoline in it is fresh. I have refreshed the gas twice. Tried some liquid carb cleaner in that also. I disconnected the fuel line while the motor was running and let it go dry. That did not work.

@erps - That is what I am thinking I may need to do, however I have never worked on an outboard before so I am looking for some guidance on how to do that. Do you know of any resources, books, sites, etc that provide solid guidance on the matter?
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Re: Carb(fuel flow?) issues with Honda 7.5 outboard

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Originally Posted by whorne View Post
Your problem sounds exactly like what I experienced with the exact same engine. I emptied my gas tank and let it dry out inside, filled it with fresh gasoline and it now runs like a top.
Also suggest you drain the carb, leave the drain plug open and open the gas valve and let some fuel flow through. If it has an external tank, squeeze the ball.
If that doesn't work try ERPS suggestion, been there, done that. My experience working with Honda was little different than Evinrude/Johnson. Just lay out the pieces in sequence, "up" side up and reverse to re-install. A big clean towel makes a good working surface.

Paul T
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Re: Carb(fuel flow?) issues with Honda 7.5 outboard

Know of any good diagrams?
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post #7 of 16 Old 06-18-2012
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Re: Carb(fuel flow?) issues with Honda 7.5 outboard

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That is what I am thinking I may need to do, however I have never worked on an outboard before so I am looking for some guidance on how to do that. Do you know of any resources, books, sites, etc that provide solid guidance on the matter?
I had a Honda 7.5 back in the late 80's, as did my father. We both had the carbs apart while troubleshooting another problem that is fairly common with those motors. The exhaust manifold starts leaking exhaust gases into the engine cover which leads to low power and stalling out at higher RPM's. It's been so long, I don't recollect how daunting the task was, but we both did it while travelling on vacation with the limited tools that were in our boats. I'll see if I can find an exploded view of the carb somewhere and post a link.

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Re: Carb(fuel flow?) issues with Honda 7.5 outboard

Thanks. I will take a look at that manual and see what I can figure out
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Re: Carb(fuel flow?) issues with Honda 7.5 outboard

another thread on the topic:

1981 Honda 9.9, 4 stroke o/b, Idle problem

Ray
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Re: Carb(fuel flow?) issues with Honda 7.5 outboard

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Thanks. I will take a look at that manual and see what I can figure out
Sorry, I posted the link before I looked at the manual. It was an owner's manual, so i deleted the link and my post. I wasn't quick enough though. Sorry.

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