40hp Mercury Engine Problems

Joined
Jun 11, 2015
Messages
8
My 40 hp mercury will crank but wont stay idleing and it will rev up on its own. It will also stay running after i turn key off. What could be the problem?
 

Expidia

Commander
Joined
Aug 26, 2006
Messages
2,368
I'd throw out a few more items to help others assist to help you diagnois your isssue

like:
the year
two stoke or 4 stroke (carbs or fuel injection)
Did it ever run OK or is it new to you?
Last tune up?
What was re-newed?

Welcome to the forum :)
 
Joined
Jun 11, 2015
Messages
8
1995 2 stroke mercury force. Single carb. Has been rebuilt. Use to run good but now it wont idle, it will only crank up for a second then die unless i give it throttle. . It has new plugs, fuel filter, fuel lines. It started this after new throttle control cable was installed.
 
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