Evinrude lightwin/yachtwin3 hp low speed fuel mixture screw

henkee

Cadet
Joined
Aug 15, 2012
Messages
10
Hi

I have a Evinrude yachtwin 1966 3hp engine and it is not running good for a long time.
It misfires sometimes, especially at low speeds and then dies but sometimes it runs for a long time before it starts to die.
I can prevent the engine to die if i give full throttle, after a while of full throttle i can go for low speed again...strange.

I have changed the spark plugs (NGK B6s) and checked the points (0.20), checked the impeller.
i have cleaned the carburator many times, changed the head gasket.

Can it be the ignition cables?


How have you adjusted the fuel mixture screw (knob)?

The older engines had mixture screws for both low and high speed but mine has only for the low speed.
 

nwcove

Admiral
Joined
May 16, 2011
Messages
6,293
Re: Evinrude lightwin/yachtwin3 hp low speed fuel mixture screw

try using the correct plugs,( if available). champion j4c if you run mostly at higher rpms, or champion j6c if you run more at low rpms. also, when you cleaned the carb, did you remove the small aluminum plug on top of the carb and clean/blow out/run a strand of small wire through all the passages in the carb?
 
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