1978 65hp Chrysler high idle

[FisherMarine]

This engine had been setting for about 1 1/2 years. I took it out for the first time and when I unloaded it from the trailer, it didn't want to idle. When I would put it in gear it would run. I then ran it about 1/2 to 3/4 throttle for about 1 mile to a cove. When I got to the cove, it again didn't want to idle. I shut it off and replaced the spark plugs. It didn't want to start. I finally did get it to start but it would idle really high. I switched gas tanks but it still idled very high. I also checked the fuel filter and it was fine. Is this a vacuum leak or maybe my carbs and fuel lines are dirty?

 

[Frank Acampora]

Re: 1978 65hp Chrysler high idle

My guess is that something is jamming your linkage and holding the carbs slightly open. Check the cable for free movement, check the timing or trigger advance (aluminum ring under the flywheel) for free movement, check the carb butterfly shafts for binding. some times the shafts get varnish on them and the return springs are not strong enough the fully close the carbs. Be sure that the roller on the carb shaft is touching the cam at idle. If not, there's your culprit. If that's the case, more than likely there is also varnish inside the carbs, so also take them apart and clean them