1972 50hp evinrude

[1sly]

hi i was given a 1972 50hp evinrude model#50273c on a older forester trihull boat.i was told that it needs a new powerpack but not real sure if there is other electrical problems or not .i would like to know if it be worth the repairs or sell it for parts and what it would be worth,the boat is junk with rotted deck.any thoughts would be helpfull
thanks:

 

[Lion hunter]

Re: 1972 50hp evinrude

Look at the stickys on this page

http://forums.iboats.com/forumdisplay.php?f=24

Start with the compression test and then perform what tests you can before throwing money at it. With that info and some pics we can probably give you a better idea.

IMHO if compression is good and the overall condition of the motor is good then it is a keeper most times. A power pack, carb rebuild, tune up parts, impellar and lower unit oil will run you about $225 ( a guess).

 

[tashasdaddy]

Re: 1972 50hp evinrude

so you understand the motor.
Hydro Electric Shift)
(J. Reeves)

The shifting setup of the lower unit is what's called a "Hydro Electric Shift", which is quite complex consisting of voltage being applied to solenoids in the lower unit which in turn change oil passages via a oil pump that supplies various pressure on a spring loaded shifter dog. The wires leading to the lower unit (at the powerhead) are "Green" and "Blue". The engine must be running or cranking over in order to shift out of forward gear.

You CAN NOT use HI VIS lube in that lower unit. You MUST USE what OMC calls "Premium Blend" lube, commonly called "Type C". (A thinner lube)

In neutral, you need 12v to the "Green" wire.
In reverse, you need 12v to both wires, the "Green" one and the "Blue" one.
In forward, there should be no voltage to either wire. (The spring loaded shifter dog forces the unit into forward gear)

To check the lower unit for proper shifting to make sure you have no trouble there, remove the spark plugs to avoid problems and to allow a higher cranking speed.

This next step eliminates the actual shift switch in case problems may exist there.... Disconnect the blue & green wires at the knife connectors (the rubber insulated boots) leading to the lower unit at the powerhead, then using jumpers, take voltage direct from the starter solenoid to apply voltage to the "Green" wire for neutral, then both wires 'Green" & "Blue" for reverse (Remember the engine must be cranking over in order to shift).
With no voltage applied, the unit should be in forward. No need for a ground jumper... the lower unit's already grounded. You may crank the engine with the key switch or by energizing the starter solenoid with a jumper wire.

279458 is still available. It is for a 1972 and has two extra (white) wires for start-in-neutral protection. Just ignore the white wires, or connect them in series with the current white wire and have the start-in-neutral feature.
Look at the 1972 parts list:
http://shop2.evinrude.com/ext/index....9aa8bdd7efb79a

 

[1sly]

Re: 1972 50hp evinrude

i checked the compression at 118 top cyclinder and 115 bottom so that is good i also pulled the black- yellow wire at pp and checked for spark with no spark present.FYI i do have muffs on while making these checks.did note the head was removed at some point because there is silicone around edge.thats where im at so far, time and funds are limited so this will be a winter project.