87 40hp wont stay running at idle

jlb7244

Cadet
Joined
Mar 26, 2006
Messages
18
I use this motor for my trolling motor so I need it to idle when in gear. I just spent $900 bucks at the dealer to get this to run right. The carbs were rebuilt and cleaned by the dealer, o ya all this work was done by the dealer. The reed valves were taken out and found to be good. Vro pump was replaced with a impulse pump. Cylinder comp is 130 on both. Spark was tested and is good and both plugs are new. all wiring was looked at and found to be good no nicks or melted. I have 3 filters in the gas line 2 in the motor and 1 in line and they are full. The mech did bend the timing advance rod a little to get it to idle down at first. It ran great for about the first 7 hours but then went back to run for a couple of minutes to a half hour then die. I cant afford the dealer to come back again at 65 for the service call and 90 an hour and I did talk to him and said he would give me a little break on the charges but I would like to fix it myself and save some money. So what should I do or look for or test.
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: 87 40hp wont stay running at idle

For that kind of repair bill, I would take it back to the dealer and make him correct the problem.
Do you know what RPM the engine is idling at, 700-750 in gear?
What plugs are you running and what condition are they in?
When it stalls, what do you have to do to get it started?
 

jlb7244

Cadet
Joined
Mar 26, 2006
Messages
18
Re: 87 40hp wont stay running at idle

Have talked to the dealer last friday and he said he would call me again sunday night to set up an appointment. Guess what no call, guess he is waiting for the ck to clear. Can't take it back since its on a 40 ft pontoon, its to hard to move the boat when it is out of water. Thats why I have to have him do a service call. I do not know what the idle is and the plugs are brand new installed by the dealer.To restart I idle it up and hit the key and it fires right away.
 
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