Honda outboard problems

[Variant_530]

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

[mikehoyt]

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

[Hobgoblin]

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.