86 mercury 8 hp 2 stroke

Northernpride

Recruit
Joined
Jun 10, 2017
Messages
1
The motor runs great but doesn't gain full speed at full throttle right away. It takes about 3 to 5 min then it will open up to full speed. After that it will be fine the rest of the day/night. Could this be spark plugs? Or to much oil mixture?
 

ondarvr

Supreme Mariner
Joined
Apr 6, 2005
Messages
11,527
Neither.

Clean the carbs and make sure the timing is advancing correctly with the throttle, if it sticks when cold it may act like that.
 

flyingscott

Fleet Admiral
Joined
Apr 8, 2014
Messages
7,985
Before you do anything check for spark when that happens. Mercury switchboxes will do that when they start to fail they will not fire one cylinder then all of a sudden kick it in.
 
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