1972 johnson 50hp

[nick34]

hey guys motor runs excelent just bought it for 350.00 not a bad deal controls and all mounted it on the boat a 1960's 15' runabout "swiss 6 "
had to beef up transom a little water logged but did a great job should last a season or two question is takes a long time to plane witch way do i move the pin and also when im w.o.t. it throws twin rooster tales and water actually comes over the transom into the tub and right back out thank god the cav plate seems to be a little lower in the water then the original motor can i install that fin looking thing on the motor and will that help keep the water out of the boat and lift the back of the boat up a little it sits a little low in the water????

 

[steelespike]

Re: 1972 johnson 50hp

Trim in (prop closer to boat for quicker planing.Don't trim in too far as it will plow.Sounds like you may have a long shaft on a short transom.Most likely
a foil will just cause trouble and cost speed.You probably need to raise the motor.

 

[divertodd]

Re: 1972 johnson 50hp

Steelespike sound correct. I run a 1967 33hp Ski Twin (Evenrude) on my 1967 Swiss 6. What year is your boat and do you have any pics? Yours is only the 2nd one I have heard of!

 

[tashasdaddy]

Re: 1972 johnson 50hp

motor need to be raise, the AV plate on that motor needs to be 1inch above the keel. if you have a long shaft on a short shaft boat, i have a great simple plan for a Jack Plate to raise the motor.

this is also great info for your 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.

 

[Chinewalker]

Re: 1972 johnson 50hp

If you put a fin on a motor that is running too deep you'll really kill your performance and can actually get some weird handling characteristics. As noted above, raise the motor to take care of the issue rather than trying a band-aid solution that won't work...
- Scott