The first is to multiply the number of litres by 2.5 and then add a decimal place to get the number of millilitres of oil that you have to add. Often, the required ratio for the motor is written right on, or near the fuel cap.įor a 40:1 ratio there are two easy ways to figure it out. Again, always check the manufacturer’s recommendation. For these smaller engines we pre-mix the gas and oil in a container and then use it as needed. This is often the case with chainsaws and some trimmers. For every 40 litres of gas you need 1 litre of oil, so the motor requires more oil per litre. Many of the other two-stroke motors we use around the cottage require a 40:1 ratio. Here is a quick chart for a 50:1 ratio Gasoline (L) The easy way to figure it out, especially if you have an odd number, say 35 litres of gas, is to double the number of litres and add a zero (an extra decimal place) to get the number of millilitres of oil you need.ģ5 X 2 = 70.0 so you need 700 ml of two-stroke engine oil to go with the 35 litres of gas. With a 50:1 ratio, for 50 litres of gas you need 1 litre (1000 millilitres) of oil. In Canada, gas is sold by the litre (L), and you normally add oil in millilitres (ml).
Gas oil ratio 1971 5 hp sears boat motor how to#
If you are going on a fishing trip to Canada you will need to know how to mix the gas and boat motor oil using the metric system. How do you calculate the gas to oil mixture in Canada? Be sure to get the details from the dealer, the owner’s manual, or the manufacturer before you take the new motor out for the first time. The break-in specification is often a 25:1 ratio. If you are the new owner of a used two-stroke boat motor, always check the manufacturer’s recommendation for the gas-to-oil ratio before you take the boat out for a test drive.įor new two-stroke boat motors, there is usually a break-in time that requires a richer oil to gas mix, meaning you need to add more oil during the initial period of operation. Most two-stroke engines that are used for boats require a 50:1 ratio although there are a number of exceptions.
Here are some tips to help you figure out the right gas to oil mixture when you are filling the boat, whether you are in Canada or the U.S. Regarding boat motors, it can be a bit confusing because you have to figure out the calculation on the spot, and it is especially difficult when you take your boat over the border because Canada uses litres and millilitres and the U.S. How do you know how much two-stroke engine oil to mix with the gas?
The challenge arises when you have to make a quick calculation with an odd number and there is a line-up of people at the dock waiting to use the pump. Pre-mixing the gas and oil in a container to be used for your boat or smaller two-stroke motors is relatively easy to sort out. How many times have you been at the marina or fishing camp getting gas for the boat and been stumped trying to figure out how much outboard motor oil you need to add to the gas tank? Two-Stroke Boat Motor Oil and Gas Mixing Tips Here is an easy way to quickly calculate how much two-stroke boat motor oil you need to put in the gas tank whether you are in Canada or the U.S. Includes a few typical accessories (oars, life preservers, etc). Capacity of 2.7 people (which I assume means 2 adults and a child). This is a circa 1974 sears Gamefisher fishing boat.
Engine reworked L/Y by Jay's marine and have receipt for $270.00 to verify. 12' sears gamefisher with 5HP outboard - $1200 (Havelock 28532)ġ2' 1995 fiberglass tri-hull sears gamefisher with trailer and 5HP Johnson outboard with new gas tank and fuel lines.I have a 5hp outboard sears gamefisher motor in good condition. Outboard motor Sears Gamefisher 5hp - $300 (Monaca).
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