high idle on 63 Evinrude 40 Lark

[march]

I've been struggling with this motor (1963 Evinrude 40 hp Lark with electric shift) for most of last summer and the battle has started up again this spring.

Last year I dealt with carb issues, starter solenoid, wiring, helicoil repair to cyl head, etc etc. Finally got it running, blew lower unit seals on test run

This spring did lower unit seals, impeller, found out starter was shot so replaced it. Motor now starts but has an extremely high idle (which is strange because it idled fine last summer).

What's my best strategy to get the idle down? I don't want to put it into gear at such a high idle, right?

Any danger to playing around with the carb adjustments with a high idle on earmuffs?

The person who changed out the starter thought that one of the gaskets (intake manifold??) might have been damaged when the starter bolts were removed. If there was an air leak there would it cause a high idle? If so, any way to repair with sealant without removing the carb and/or starter?

Need to get this motor running well since I've now invested a bunch of $$$ in it!!

thanks
Marc.

 

[Chris1956]

Re: high idle on 63 Evinrude 40 Lark

Mark, If memory serves me, the idle stop was on the remote control box, or the bell crank where the throttle cable is attached. It was a nylon screw, which you turn out to slow the idle down.

 

[F_R]

Re: high idle on 63 Evinrude 40 Lark

The idle speed screw is on the forward end of the remote control, a plastic knob.

Do you have the hose connected between the intake manifold and automatic choke diaphragm housing? If not, it will suck air and make it rev up. Same thing about the hose from intake manifold to vacuum cut-out switch.

 

[larky]

Re: high idle on 63 Evinrude 40 Lark

I like to look at the easy stuff first. Is it idling high because it's on the muffs. No back pressure from being submerged in water?

 

[tashasdaddy]

Re: high idle on 63 Evinrude 40 Lark

FR is on to something, that hose could have been knocked loose. here's good carb adjustments: http://www.iboats.com/bbboard/bbBoard.cgi?a=viewthread;fid=28;gtid=818798;gpid=818802

 

[march]

Re: high idle on 63 Evinrude 40 Lark

Thanks for the advice, I played around with the idle control screw on the remote assembly and it straightened out the idle. Great!

Marc.