Re: evinrude big twin 40 1968 never used
Wow, that motor does look brand new! If you are going to use it, do pay attention to what others are saying about fuel lines & impeller especially. The impeller will certainly have taken a set at least, and possibly be brittle after all these decades. That would mean the impeller would self-destruct, sending bits of rubber into all the cooling passages, lines and water jackets. That in turn could cause overheating or a hot spot that could warp the head or otherwise damage the motor, and that would be a real shame. Besides, impellers are designed to be a consumable item that should be replaced ever couple of years to a max of 10 years. Also the fuel lines are not ethanol-tolerant. Unless you are fortunate enough to be in one of the few places in North America that offers ethanol-free gas, those brand new but aged old lines will deteriorate internally, sending bits of rubber into the virgin carburetor causing all kinds of unnecessary problems.
In post #9 you posted 5 pictures. In the first picture there is a red sticker on the cowl. That sticker was present on new OMC motors of the era and it was to advise the operator to double up on oil for the first couple of tanks of fuel. Newly machined surfaces need to wear in and until they do, they generate extra friction and heat. Because of that you should run 24:1 for the first 2 tankfulls, varying the load and speed. Avoid full throttle for the first 30 minutes of operation, but you can run it up after that time for brief periods to help seat the rings. Just avoid sustained full throttle after that time, but it is actually good to touch on full throttle for short bursts. After a couple of hours, maybe the first 4 to 6 hours you can run the motor however you like.
I would also suggest you take lots of hi-res pictures of your motor and tank before putting it into service. I know that Peter McDowell at North York Marine does not have the tank decals for the Evinrude tanks that new. He might be forever in your debt if you contact him with some clear, measurable shots of the tank. I sent him a set of the very last brand new decals for the 1971 Evinrude Lightwin 4-horse motors that BRP had in the system so he could reproduce a perfect set from them. I also grabbed the last set of replacement decals for the metal 3 U.S.gallon (2? Imperial) tanks. What I ended up with were OMC decals, and 1 or the 2 in the set was damaged while stored on the dealer's shelf. I just need to find it in order to get that one reproduced.
In order to preserve the excellent condition I would also carefully wax the exterior of that motor fully before it hits the water. Score!
) it. I've never done it before personally, and I believe the equipment is getting hard to find, on this side of the pond any way.
