idle mixture

biggjimm

Chief Petty Officer
Thread starter
Joined
Jul 15, 2015
Messages
403
Hey guys, have been over in the I/O department as I'm working on my old ski boat & this outboard has been running great. My question is do the carbs have an adjustable idle mixture or is it controlled by fixed jets? It's a 1990 60hp Johnson w/ vro removed. Serial #TJ60TLESM. It appears to be running rich at idle. The plugs are soaking wet every time I've removed them. It will load up after idling for 10-15 minutes & it seems to be using an awful lot of fuel in general. It fires up easily enough when it's cold & when it's warm I can't turn loose of the key fast enough, it's running as soon as the starter engages. Any thoughts? Compression & spark are good & new non vro fuel pump & all new fuel lines. It runs great just using a lot of fuel & seems especially rich at idle. Thanks. Jim.
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
18,196
On the carb should be a slotted screw with a spring.
Remember where it's set at now.
Slowly/ gently turn it in till it stops.Remember the turn and post them.
Then start at 1 and 1/8th turn out.
Adjust from there.

Excessive fuel can be the fuel pumps diaphragm got a small hole?
 

biggjimm

Chief Petty Officer
Thread starter
Joined
Jul 15, 2015
Messages
403
Ok Jerry, thanks. And adjust it to obtain the smoothest idle like any other motor?

It has a new fuel pump which I had apart prior to installing it to make sure it was good to go.
 
Top