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Old 06-09-2018, 11:57 AM   #46
Carl Martin
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City: Port Richey
Vessel Name: Olive Oyl
Vessel Model: Scout 30, Caribiana 23
Join Date: Oct 2007
Posts: 245
I think doubling the amount of oil is a mistake. The plugs will foul quicker, there will be more carbon build up which will actually reduce the life of the motor and there will be less complete combustion which means you'll end up dumping more unburnt oil & gas into the water. Yamaha would not spec 100-1 if it wasn't what was best for the motor. I have a lot of hours on my '06 motor at 100-1 & I've had no problems.
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