Oil/Ratio For 90 HP Merc/Force Sport Jet

spullon

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Dec 31, 2015
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Are all 2 cycle oils the same and is 50:1 ratio for the 90 hp Merc / Force Sport Jet too rich?
 

GA_Boater

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Are all 2 cycle oils the same and is 50:1 ratio for the 90 hp Merc / Force Sport Jet too rich?

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2 stroke outboards require TC W3 oil which is formulated for water cooled motors. If the motor is not oil injected, meaning it has no oil tank, the fuel/oil ratio for Mercs is 50:1. If it is oil injected with an oil tank, the metering system delivers the correct ratio.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,297
That would be the FORCE powerhead.-Most of these units are operated in the constant idle / full throttle / idle / full throttle mode.----I would mix it at 40: 1 if you intend on running it like that.
 

H20Rat

Vice Admiral
Joined
Mar 8, 2009
Messages
5,201
Unless someone modified it, that engine ALWAYS came with a fairly reliable oil injection system... DO NOT MIX in that case.
 
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