Hot afternoon and grouchy carb

R

rbh

Fleet Admiral
Joined
Mar 21, 2009
Messages
7,939
1985 merc 260 thunderbolt 4, merc carb# 1347-8292 rotchester 4mv
(new everything, except motors)
OH and I tightened down the front 2 mounting bolts/nuts on the carb as the were not much more than finger tight.

Well this has gotten progressivly worse over the last couple years and we were going to splash the boat for the first time this year.
put the ear muffs on and fired up the port motor, great no problems.
Go to the starboard engine, earmuffs, and crank crank crank over and over, yup flooded it retried ten minutes started ruffly, take it up to 1500+- rpm runs great, wait till choke fully opens and back it to idle "BLAH" dead.
finally starts to idle alittle before it dies and holds around 450-500 RPM???

What do I need to adjust the IDLE???
air/idle screw,
pull up the RPM's by adjusting the linkage??

What's your thoughts

Thanks
Rob
 
Bondo

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,082
Re: Hot afternoon and grouchy carb

Well this has gotten progressivly worse over the last couple years and What's your thoughts
Click to expand...

Ayuh,.... Sounds like it needs some serious Maintanance,.... Like a Carb Rebuild...Or More...
 
R

rbh

Fleet Admiral
Joined
Mar 21, 2009
Messages
7,939
Re: Hot afternoon and grouchy carb

Not sure what make the carb is except for the merc #'s I pulled off the tag.
But I wish I knew were the idle/fuel air mix screw was so as to check it,
and or adjust the linkage???

Found it, rotchester 4mv
 
D

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,332
Re: Hot afternoon and grouchy carb

maybe time for a complete tune-up, check/set timing, adjust carb properly

great info in the manuals section here
 
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