merc. 140 inline, idle's at 2500-3500 rpm's????

toocanshan

toocanshan

Petty Officer 3rd Class
Joined
Mar 9, 2009
Messages
94
i need help i had just bought this boat yesterday and i tried to run it today and the rpm's are of the charts. this morning i put a new impellar in and then i took it to the lake and i can't get the rpm's to drop. i did not even try to run it becouse i was affraid to drop it into gear at those revs. if anyone can help me that would be great. thanks toocan. im not new but returning from the past, with my new 1978 glastron 16' with the inline.
 
madgadget

madgadget

Petty Officer 1st Class
Joined
Sep 28, 2009
Messages
281
Re: merc. 140 inline, idle's at 2500-3500 rpm's????

Id check that the throttle is closing fully and that the throttle butterflies are also closing as they should be...
 
F

Fuzzytbay

Chief Petty Officer
Joined
Jun 6, 2008
Messages
557
Re: merc. 140 inline, idle's at 2500-3500 rpm's????

Is the fast idle lever on? Year/serial number might be of help too.
Check your butterflies in the carbs. See if they move.Its either the idle is set to high, the cable is missadjusted, or not connected at all. The control box is out of adjustment, or the cable/control box is NFG.
 
toocanshan

toocanshan

Petty Officer 3rd Class
Joined
Mar 9, 2009
Messages
94
Re: merc. 140 inline, idle's at 2500-3500 rpm's????

thanks guys ill check those things in the morning. the serial # is 4866506 and the model # is 8526622. thanks for all your help and info.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,149
Re: merc. 140 inline, idle's at 2500-3500 rpm's????

Remove the wrap cowling and see if the throttle is pushed closed by the throttle cable. The throttle should be completely up against the stop, when the handle is in neutral and the cold start lever is down. If not, remove the barrel nut from the clamp and adjust it to push the throttle closed.
 
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