Re: Trying to find the year on a Evinrude Lightwin 3hp
How do yall figure out the year? ex.1964 My Great Grandad who just passed the little boat and motor down to us thought the boat was a 1938 and the motor was a 1943. The boat turned out to be a 1940 Starcraft and the Evinrude Lightwin 3hp is unknown. Someone says it's a 1964 but that seems too new since he thought it was about a 1943.
Re: Trying to find the year on a Evinrude Lightwin 3hp
TCW 3 - Walmart carries it as well as most auto parts stores
From Evinrude FAQ page:
What is the fuel/oil mix for my motor?
A - The following is generally true: 1958 and prior used 20:1, 1959 thru 1963 used 24:1, 1964 and newer use 50:1. High performance usage (racing) requires a ratio of 25:1. New engine break-in (not DI) requires 25:1.
I believe the original manual would have said 40:1.
Re: Trying to find the year on a Evinrude Lightwin 3hp
To be honest with you, NONE of those 3hp's should be run with 50:1. Unlike all the other motors, these are not built with needle bearings at all. Even the newer 4hp Light Twins were the same way. The 4hps were all improved with the needle bearing set ups, when they redesigned them with the full shift lower units.
To be honest with you, NONE of those 3hp's should be run with 50:1. Unlike all the other motors, these are not built with needle bearings at all. Even the newer 4hp Light Twins were the same way. The 4hps were all improved with the needle bearing set ups, when they redesigned them with the full shift lower units.
Well that is a matter of opinion. Many of these 3hp Lightwins, including his 64, have fixed main jets. The lower your ratio, the more you are leaning the fuel / air mixture. They were designed for 40:1. I would not go less than that. The reason they are now recommending 50:1 is because of supposed improvements in oil. I use 40:1 in my 67 Lightwin. Tryed 32:1 and it was running like it was too lean.
Re: Trying to find the year on a Evinrude Lightwin 3hp
Well, what happens on these little buggers, is the crank journals and rods heat up and the rod bends.....then SNAP!! Fixed jets don't really determine the mix ratio. It's the construction of the crank and rod assemblies. All other motors are needle bearing (fully jeweled) and are set up for leaner ratios, but the old Light Twins even up into the 1980's still has the same set up as the old 5 1/2s did in the 50's. I rebuilt a 1970 4hp Light Twin because of "mr 50:1" In fact, that very motor is how I came up with my signature below.
