Mariner 15hp shaking on idle

J

jono_uk

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Dec 9, 2007
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24
i have got a 15hp mariner about 1979 when its idling the engine shakes left to right constantly when it gets to 3/4 throttle it tends to smooth out has anyone got any ideas??? I have replaced the points and condensors both plugs are sparking good
 
L

Laddies

Banned
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Sep 10, 2004
Messages
12,218
Re: Mariner 15hp shaking on idle

It sounds like it could be flooding at low speed or is dropping a cyl check it for spark while it is acting up
 
J

jono_uk

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Joined
Dec 9, 2007
Messages
24
Re: Mariner 15hp shaking on idle

thanks laddies i have noticed a bit of oil in the water from exhaust and was wondering if running rich ill check spark plugs tommorow whilst running ive only just put new ones on the other week checked them tonight and none of them were black they where both still clean
 
J

jono_uk

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Joined
Dec 9, 2007
Messages
24
Re: Mariner 15hp shaking on idle

Laddies said:
It sounds like it could be flooding at low speed or is dropping a cyl check it for spark while it is acting up
Click to expand...

i know this sounds stupid bit of a newbie question but flooding at low speed what would cause this wrong float setting??
 
Yepblaze

Yepblaze

Lieutenant Commander
Joined
Jun 1, 2001
Messages
1,686
Re: Mariner 15hp shaking on idle

Apparently these motor aren't known as a smooth idlers.

I've got the 25hp ver. and it sure aint no old Johnson when it comes to trolling
 
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