Timing still factory?

ian1739

Cadet
Joined
Jul 24, 2009
Messages
13
73 merc 850, factory sticker says 27?btdc. Does this still apply with newer fuel?

Thanks
 

corm

Lieutenant Junior Grade
Joined
May 12, 2000
Messages
1,241
Re: Timing still factory?

Hi,

The 85 hp was not as hard on burning piston tops ar the 3 cyl or 6 inlines.
So you would probably be ok.
Having said that, I have noticed that the fuel this summer has varried a lot. So if your using the engine hard I would back it of 2 degrees just to be on the safe side. I just removed the backdraft jets on my motors.
It lets them run a shade richer.
 
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