idle, idle, idle, idle, cough, idle idle etc...

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diverjjeff200

Recruit
Joined
Sep 10, 2003
Messages
2
Hey everyone,<br /><br />First and hopefully last post. Can't figure this one out. 75 Evin 115hp low hours. While idleing after about 10-15 seconds the motor COUGHS. Then back to idleing 10-15 seconds then COUGH. Motor recovers after the cough and idles fine till next cough. Carbs have recently been rebuilt and a new power pack. Any ideas would be greatly appreciated.<br /><br />Safety & blue skies,<br /><br />Jeff
 
T

The Marine Doctor

Commander
Joined
Jul 25, 2003
Messages
2,177
Re: idle, idle, idle, idle, cough, idle idle etc...

Sounds like a lean pop..check the fuel lines for leaks...Also...hit the choke..see if the pop goes away.<br /><br />Might have to do the carbs again...or get it more fuel on the bottom end.<br /><br />TMD
 
D

DJ

Guest
Re: idle, idle, idle, idle, cough, idle idle etc...

TMD is correct. Cough means-lean mixture.
 
D

diverjjeff200

Recruit
Joined
Sep 10, 2003
Messages
2
Re: idle, idle, idle, idle, cough, idle idle etc...

Thanks for the advise. This gives me direction to follow.<br /><br />Safety & blue skies,<br /><br />JD
 
D

Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: idle, idle, idle, idle, cough, idle idle etc...

Make sure your carbs are clean. Go through your sync & link as outlined in the service manual. If all is well there you may have to richen up the idle circuit on the carbs. Its not really that unusual on those older motors. They are calibrated for the available fuel from the date on manufacture. We dont have 1975 fuel anymore.<br /><br />Its of concern that you say "low hours". That leads us to believe the motor may have been sitting and a simple carb cleaning will get you going. Use OE carb kits, fresh 87 octane and Champion plugs.<br /><br />Good luck!
 
S

seahorse5

Rear Admiral
Joined
Jan 24, 2002
Messages
4,698
Re: idle, idle, idle, idle, cough, idle idle etc...

If the thermostat is not warming up the motor enough, you will also have a lean idle "spitting" condition. Put your hands on each cylinderhead after it has idled for a few minutes, if you can keep your fingers on the head for more than 3 seconds, the motor is not warming up. It should run at around 140 degrees, plus or minus 15.
 
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