Gas-to-Oil Ratio for Lawn-Boy Mowers

Mower Specifications

• Each mower designed by Lawn-Boy will change specifications. This will occur from model to model and year to year. For this reason, on a two-cycle Lawn-Boy engine, there isn’t a specific ratio of gas to oil, and the ratio will vary considerably from engine to engine. The most common ratios for engines are 16-to-1, 32-to-1 and 50-to-1 gas to two-cycle engine oil. These mixtures will require 8, 4 and 2.6 ounces of engine oil for every gallon of gas, respectively.

Locating Your Specifications

• A Lawn-Boy mower will have a small decal on or near the fuel tank, usually on the frame of the engine block. This decal will tell you what type of fuel is required in the engine and, most often, what the gas-to-oil ratio is for your engine. If this decal has been taken off or worn away, the mix ratio can be found in your lawn mower’s product manual or from any authorized Lawn-Boy dealer or mechanic.

Warnings

• If the right gas-to-oil mixture can’t be found, don’t put any fuel into the tank or run the engine until the right gas is put into the mower. Different engines run at different rpm and produce a wide range of engine temperatures. If there’s too little oil in your fuel, the engine may burn too hot, and damage to the piston and crankcase can occur quickly, often in less than a minute. If the piston or crankcase get damaged, it will most likely destroy the mower.

Tips

• Fuel, either mixed or straight, will destabilize after 30 days. As the fuel degrades, the quality of engine performance will also go down. This can cause a variety of starting and running problems in the engine. If the gas is older than 30 days, remove it from the fuel tank and dispose of it properly according to local environmental regulations. Mix or purchase only what you plan to use over 30 days. If the lawn mower is going to be stored, run the engine until all of the gas has been burnt off and the engine dies.