Evinrude 75 hp 1960...ish

[tigerone]

I cannot find the model or sin# tag on this motor. I have a manual that shows what kind of lower unit I have. Can anyone tell me if this is the correct year or is there more than one year that this L.U. was on this motor? I have I a magneto ignition system that the manual states is on the 75 hp from 1960-1965. I have a type II manual shift with single enclosed housing. Manual again states this lower unit is on the 75 hp from 1960-1965.

One big reason why I am chasing this down is because there is no Generator on this engine where I see a spot for a generator on the port side of the engine. I see under the flywheel where the belt for the magneto system has a pulley or wheel that it attaches to, but even if there were a generator on this system there is no wheel for the belt to go on under the flywheel.

Does this system need a generator to run?

Thanks for any input

 

[F_R]

Re: Evinrude 75 hp 1960...ish

I cannot find the model or sin# tag on this motor. I have a manual that shows what kind of lower unit I have. Can anyone tell me if this is the correct year or is there more than one year that this L.U. was on this motor? I have I a magneto ignition system that the manual states is on the 75 hp from 1960-1965. I have a type II manual shift with single enclosed housing. Manual again states this lower unit is on the 75 hp from 1960-1965.

One big reason why I am chasing this down is because there is no Generator on this engine where I see a spot for a generator on the port side of the engine. I see under the flywheel where the belt for the magneto system has a pulley or wheel that it attaches to, but even if there were a generator on this system there is no wheel for the belt to go on under the flywheel.

Does this system need a generator to run?

Thanks for any input

As you already know, the 75 was made for a number of years. To answer your specific question, the generator is only needed to recharge the battery and was an optional at extra cost accessory kit. The battery is only used for the starter, so no big deal--charge it at home.

 

[Chris1956]

Re: Evinrude 75 hp 1960...ish

A lot of the johnnyrude V4 motors w/ manual shift gearcases and magnetos from that era did not have or need generators. On others the generators went bad.

If you had no generator or it was bad, you simply used a battery to operate the electric starter. When the starter spun slowly, you would charge up the battery.
The motors also had a pull start.

It would be difficult for you to find a generator and voltage regulator for that motor, I would suspect. I suggest a good marine starting/deep cycle battery combo.

Your model number should be something like V4SL-...

 

[tigerone]

Re: Evinrude 75 hp 1960...ish

Thank you for the input on this. I got a new solinoid for it and it is now turning over with very intermittant spark to cylinders 2 and four only. I have a manual, but where should I start the trouble shoot? At magneto, points, coil and such? The boat and engine have been sitting for a long time in a field.

Thanks!

 

[Chris1956]

Re: Evinrude 75 hp 1960...ish

Magneto has two sets of points. Make sure both are clean and gapped to .020 In. Since you have spark, the condenser and coil are likely good.

You might clean carb. You also might PM Joe Reeves if you have any difficult questions. He is a real expert on those motors.

 

[blk98gt]

Re: Evinrude 75 hp 1960...ish

I believe Evinrude made 75hp motors named Starflite and Speedyfour. One with generator and the other without. You tube has a nice video some guy posted of the speedyfour. If you take a picture of the motor cover I might be able to tell you the year.
How are you checking the spark? Ours was a little weak but it runs.

 

[tigerone]

Re: Evinrude 75 hp 1960...ish

I am not getting any spark out of any plug wires now. I took off magneto assy as stated in manual, and was turning the wheel around to test for bearing viability etc. I was doing this with the distributor cap off. I got my hand in just the right (or wrong) place and felt it discharge. So there is something going on there. Does anyone have any input on why it will discharge into me but not out of the plug wire? Bad distributor cap, wires, rotor, wire points etc? Will I see spark out of the plug wire and plug if I have it off the engine and am turning it by hand? Do I need black wire, located on starboard side of unit, to be grounded?

Thx

 

[steelespike]

Re: Evinrude 75 hp 1960...ish

Some of those old distributor mags have rotors that are really hard to come by.Not sure about the caps.And don't know the years.I've heard of people paying $60 for a rotor.Look over the cap and rotor inside and out. Look for cracks and carbon traces.Try cleaning with contact cleaner and a soft cloth.
Some of the old ones the plug wires are threaded into the cap.

 

[F_R]

Re: Evinrude 75 hp 1960...ish

Some of those old distributor mags have rotors that are really hard to come by.Not sure about the caps.And don't know the years.I've heard of people paying $60 for a rotor.Look over the cap and rotor inside and out. Look for cracks and carbon traces.Try cleaning with contact cleaner and a soft cloth.
Some of the old ones the plug wires are threaded into the cap.

Yes, however an orderly process is in order. Take the cap off an get fire from the coil by fixing whatever is wrong----Then worry about the distributor rotor and cap.

Rig up a 1/4" spark gap from the coil button to ground. Then turning the pulley by hand should produce a healthy spark across that gap. Or to you (yuk, yuk)

The wire from the breaker plate must be connected to the stud on the side of the housing. The other wire (when installed on the motor) is the kill wire and is not needed when bench testing the mag.

Yes the plug wires are screwed into the cap, so don't yank them out.

 

[tigerone]

Re: Evinrude 75 hp 1960...ish

Set up a 1/4 " gap and tested coil button as F R described. Got a nice good spark jumping the gap. So I can assume that the deficiency is in the cap somewhere. I see no carbon buildup and the wire points are clean. Continuity test from ignition coil button contact point to rotor contact point may be the next step eh?

Thanks for the good input!

 

[F_R]

Re: Evinrude 75 hp 1960...ish

Set up a 1/4 " gap and tested coil button as F R described. Got a nice good spark jumping the gap. So I can assume that the deficiency is in the cap somewhere. I see no carbon buildup and the wire points are clean. Continuity test from ignition coil button contact point to rotor contact point may be the next step eh?

Thanks for the good input!

A very common thing that happens is that the spark jumps from the flat metal arm of the rotor, right through the plastic and to the distributor shaft. When it does it burns a tiny pin hole through the plastic which is virtually invisible to the eye. We made use of the spark output from a the coil tester to test them.

New rotors come with a little gob of insulating grease inside to help prevent the arcing through.

But yes, a continuity test of the wires is always in order.

 

[tigerone]

Re: Evinrude 75 hp 1960...ish

I see some holes in the sides of the rotor . When putting spark through rotor arm I put a grounded wire into the shaft hole and can see spark going through the plastic and into the wire. Is there any way to fix this or just buy a new part?

The holes in the side of the rotor are about 1/16" diameter. But spark is not jumping through those. Just up from the metal arm through to shaft hole.

Good strong spark though. It found me for a ground once

 

[tigerone]

Re: Evinrude 75 hp 1960...ish

Just for fun and troubleshooting purposes I filled the holes in my rotor with melted rubber and lined the inside of rotor with one layer of electrical tape, to hopefully reduce transmission of spark to rotor shaft. It worked. I have full spark on all four plugs and wires. Got quotes back from four different parts places on a new rotor. All want at least 40.00 + shipping. How long do you think my backyard rigging will work?

 

[blk98gt]

Re: Evinrude 75 hp 1960...ish

I don't how it will work but I know how good it feels when you fix something that way Wait till you hear that beast running. We just took our motor out yesterday and it ran good just didn't propel. Spun hub on the propeller only allowed us to idle around.
Just 10 minutes of idling and some throttle tests burned over a gallon of gas.

 

[tigerone]

Re: Evinrude 75 hp 1960...ish

blk98gt,

That is a LOT of gas

Just broke my glass bulb that goes over the fuel filter. Need a new filter anyway so I guess I will add that on to the bill. Just working on the timing now. It coughed and sputtered though.