Logo
FULL SITE MENU

Mariner 60hp idle problem

D

D4V33

New member
Hi all,
I have an old mariner 60hp 2 stroke outboard. I believe it was originally Yamaha. Have also seen 55hp version.

Was planning on taking the boat out soon now the weathers getting better, but seem to be having idleing problems. The engine keeps coughing and sometimes bogs down and sometimes cuts out.

Ive gave the carbs the usual clean and checked the reeds, but still having issues.

I can't seem to find the sweet spot for the air mixture. I have managed to get it running nicely and thought it was solved, but switched the engine off for ten minutes, started it again and the problem was back.

any ideas what might be causing this? Air mixture or something else?

thanks and sorry about the long firs post.
 
Sounds like your carbs are flooding. When you shut her off and fuel collects to mess up the idle. Long as it's running the mixture--which is dialed in too lean--is correct WITH the additional gas from flooding. Common problem.

How did you give "the carbs the usual clean"?

Jeff
 
fastjeff said:
Sounds like your carbs are flooding. When you shut her off and fuel collects to mess up the idle. Long as it's running the mixture--which is dialed in too lean--is correct WITH the additional gas from flooding. Common problem.

How did you give "the carbs the usual clean"?

Jeff
Click to expand...

Thanks for the reply!

as per cleaning the carbs, every year I normally remove them, take the fuel dish off and give all the jets/ports a good bast through with carb cleaner to remove any residue. I did not remove the floats, just tried to make sure all the jets etc where clear.

how should I make adjustments to stop the carbs flooding, as this does sound like it could be the problem.

thanks, much appreciated!
 
Take the carbs, one at a time, and clamp them in a vise. Hook the fuel hose to them and pump HELL out of the bulb. If--when--they leak, raise the float level a 1/16 inch at a time until it stops leaking. Then reassemble everything and go boating.

Jeff
 
fastjeff said:
Take the carbs, one at a time, and clamp them in a vise. Hook the fuel hose to them and pump HELL out of the bulb. If--when--they leak, raise the float level a 1/16 inch at a time until it stops leaking. Then reassemble everything and go boating.

Jeff
Click to expand...

Perfect!, will give this a try and see if it solves the problem!

Again, many thanks!
 
fastjeff said:
Take the carbs, one at a time, and clamp them in a vise. Hook the fuel hose to them and pump HELL out of the bulb. If--when--they leak, raise the float level a 1/16 inch at a time until it stops leaking. Then reassemble everything and go boating.

Jeff
Click to expand...

Had a look tonight after work. I removed the air intake and opened the butterfly's on the carbs up so I could see inside, pumped the bulb and just like you predicted, fuel leaked up through the bottom carb. I made a slight adjustment to the float which stopped the fuel leak and now the outboard seems to be running pretty sweet! I don't have a manual so, not sure what the recommended air mixture settings are, but have they at 1 3/4 turns at the moment. Does this sound ok?

Anyway, a massive thanks for all your help. Much appreciated!
 
That motor is HELL to get a proper idle adjustment on. After years of frustration I've found the best way to do it is with an infrared temp gun. Aim the dot on the metal shell of the plugs and dial the idle mixtures until all three plugs are the same temperature (about 90 degrees). Use the lowest idle you can get away with. When you're done, add 1/4 turn OUT (CCW) to both carbs.

Jeff
 
fastjeff said:
That motor is HELL to get a proper idle adjustment on. After years of frustration I've found the best way to do it is with an infrared temp gun. Aim the dot on the metal shell of the plugs and dial the idle mixtures until all three plugs are the same temperature (about 90 degrees). Use the lowest idle you can get away with. When you're done, add 1/4 turn OUT (CCW) to both carbs.

Jeff
Click to expand...

Perfect! I have an IRtemp gun at work. Will borrow it and give this a try. Never heard it done this way before.

Thanks a million mate.

Regards
Dave
 
Back
Top