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  #1  
Old 06-20-2002
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Honda outboard problems

I have an 80s Honda 7.5 Horse power outboard with a peculiar problem.
The engine looses power and sputters with the cowling on. As soon as I release the cowling cover the engine perks right up.
I checked the exhaust pipe and there is no exhaust leak. I''ve tried tuning the carburetor and that doesn’t help. Can any body offer a suggestion to remedy this problem.
Thanks
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Old 06-21-2002
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Honda outboard problems

I have same engine and have not had that problem.

Recently took mine in to a dealer for servicing. Cost $60 (1 1/2 hours labour) to have carb cleaned, needles blown out, compression checked, valves adjusted, etc... Had to take it to a motorcycle dealer (go figure). Might be worth a try.

I would check to see if the cowling is pinching or touching anything. Maybe you are touching a spark plug wire, fuel line, or something? I am sure you checked this out.

Another common fix for these engines is brand new plugs. I am sure you probably already tried that. Use NKG I think DH5HS?

Good luck!

Mike
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Old 07-08-2002
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Honda outboard problems

There''s no doubt your problem''s the cowling.
Check for chafing inside(fuellines,vacuumlines from carb., sparkplug-leads,etc), if not, there is a venthole somewhere, to provide intake-air ,this might be clogged.
Succes.
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Old 11-17-2008
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It's an Exaust leak. I have the same problem. You can eliminate the possibility of hitting plug wires and such by blowing in the cowling with an air hose when it's running..it will speed up when the fresh air hits the carb. I read another posting where a guy had the same problem and pulled the powerhead and replaced the rubber gaskets below the exaust pipe and then his motor ran great. Going to attempt it with mine soon. You could drill holes all over your cowling too but that's up to you.
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Old 11-17-2008
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Quote:
It's an Exaust leak. I have the same problem.
Ditto. We had the same experience. Leaking exhaust gets sucked back into the carburator and messes up the fuel/air mixture.
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Old 11-17-2008
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MarleyBird-

Thanks for the info, but I doubt it much matters as the post you're responding to is over SIX YEARS OLD. If they haven't found and fixed the problem yet, they probably threw the outboard over the side.. Do check dates on posts before replying...
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Old 11-18-2008
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I guess you might be pinching a fuel line with the cover in place.

You say it is not an exhaust leak so maybe there is no air getting under the cover, or at least enuff.

Quote:
Originally Posted by Variant_530 View Post
I have an 80s Honda 7.5 Horse power outboard with a peculiar problem.
The engine looses power and sputters with the cowling on. As soon as I release the cowling cover the engine perks right up.
I checked the exhaust pipe and there is no exhaust leak. I''ve tried tuning the carburetor and that doesn’t help. Can any body offer a suggestion to remedy this problem.
Thanks
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Old 11-18-2008
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Never Mind!
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Old 11-18-2008
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That is a Honda BF75

This post is so old that teh problem I did not have in 2002 did occur in Spring 2008 as I was commissioning the boat for new owners.

Symptoms were that the engine ran fine all 2007 sailing season until last day. Then it started fine but no power when leaving dock. Pulled back in, removed cowling, tinkered and it ran fine. Put cowling back on went to leav and it screwed up again. In the end I just went out for a quick trip with the hood off.

Next Spring boat had been sold and I was commissioning for new owners. Part of the deal was that I would have the engine serviced. During this service the tech told me about this leak and it did the exact same thing.

Well it is a 1979 engine so 30 years of service I think is enough.

Mike


ote teh post is 6 years old. The OP probably sold his engine a long time ago as well
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Old 11-18-2008
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Thanks for the info, old post or not. I have that model and hp.
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