If not using the VRO system, a 50:1 ratio is required, this is roughly one pint of 2 cycle oil to six gallons of fuel.
'92 Johnson 115s are VROs which will vary fuel"oil ratio if operating properly. At idle, should be the 50:1 std. up to 100:1 at WOT. Some owners bypass oil-side of balky VRO pumps and pre-mix. Pretty bullet-proof motor if no VRO problems and seasonally maintained.
Fuel ratio is 50:1
more than likely 50 to 1
How much oil do I use per gallon of gas for a 40 HP Johnson motor
If it is an oil injected, (VRO) model, add nooil to the fuel. If running without the the oil injection system, use a 50:1 fuel to oil ratio, roughly one pint of 2 cycle oil, to six gallons of fuel.
This engine should have a VRO pump and if it has been bypassed the mixture is 50:1
The Johnson outboard models equipped with VRO, (varible ratio oiling), have an onboard oil reservoir. Use a good quality, TC-W3 rated, 2 cycle oil. It is also good practice to not mix various brands of oil in the VRO tank, as reactions of additives in certain brands can lead to filter gelling.
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