Fisherman Rob
Well-Known Member
Is it worth putting premium fuel into a 1996 2 stroke Yamaha 115?
Actually I was wondering about that. Is it cheaper to buy fuel at the dock?
Back in the day I bought a new 2-stroke from Bob Cole at Port Boathouse in port Alberni.
I asked him that exact question at the time.
His reply was " certainly won't hurt......it's actually better for the engine seeing as how it's got aluminum pistons".
Anyone know the ethanol mix for the Marked 89 octane gas? Also I noticed that the tint in marked gas defintiely gets into the crank oil so I think I will be changing my oil more often tahn every 100 hours.
Co-op marked gas is another reason to shop there;well shopping local, shares & 5% kickback helps too...Nope. Some Co-op stations have marked midgrade. I burn it in my 2stroke.
I think that may be due to trolling speeds when the engine never really reaches operating temperature, so it does not fully burn the fuel during the power strokeThe dye in gasoline does make its way into the crank cases of 4 stroke engines trough fuel dilution but it will harm nothing just looks very red .Yamaha engines seem to be more prone to having fuel in the crank case
Thanks TS that was very informative and good to know.Typically, in Canada, gasoline is 10% Ethanol for 87 octane, 5% for 89 and 0% for 91. This is because there are only two grades of fuel commonly refined; 87 and 91. 89 is a 50/50 mix of 87 and 91. It's either mixed in the pumps or mixed by the fuel truck as it unloads to make 89.
Some stations, like Mohawk have up to 10% in all their grades. Either way it should be labeled on the pumps. Any fuel that contains 15% ethanol has to be marked as E15 as not all motors are compatible with 15% ethanol mixes.
In 4-stroke engines there is always a small amount of fuel that gets by the rings and into the crankcase. There are additives in the oil to help neutralize it but that is also one of the reasons it needs to be changed often. The dye in the marked fuel just makes it easier to see.