Mag plate to magnetic???

[Ntr]

Hi guys, picked up a 1975 evinrude 40hp. I went through all the ingnition, timing etc. And had to zip tie the mag plate in the advanced position to,start it.
I first noticed the flywheel was hard to take off for magnetic pull. Then I tried to time with a multimeter and the magnets were,pulling the points closed so I set the marks, removed flywheel and then set points. The motor starts and runs great now but WILL NOT run on the cables without mag plate zip tied in advance position.
I checked the p/n and there are 2 flywheels used this year. 1 rope, 1 electric. I have not verified my P/N yet but the one I have had timing marks for R and E.
Here is the situation: the magnets in flywheel are turning the timing plate. It's stronger than the throttle linkage. The flywheel has 6 magnets. This model has 1 driver coil and the 3 coil pick up for the charging system.
The correct flywheel should be 581345. Does that one have 3 magnets OR am I missing something?
Yes the coils are adjusted and not hitting, the timing plate moves freely with flywheel off.
Again, if I put it in neutral and zip tie the plate as far as it will go in advanced position it does run and very well indeed. Cut the tie and it slams into retard position. I have no internet where the boat is so if the Flywheel checks out I am stumped BUT I do have a few 2 magnet style ones from the late 60's with the belt for generators on selectrics. The motor appears to be all original and that's why I feel I am missing something critical. Wrong flywheel or did somebody magnetize tomthe extreme?
Thanks in advance.

 

[racerone]

The flywheel from the 1960's only used 1 magnet.

 

[Ntr]

Yes. The one on the motor has 2 magnets with 3 banks = 6 magnets total. That's why I thought to try and swap older flywheel.

 

[Ntr]

I see somebody just posted about the 1 vs 2 magnets and they can swap one way depending on the driver coil(s).
In my scenario the magnets are strong enough to pull the points closed.

 

[oldboat1]

Sufficient air gap, or is the driver coil or stator binding?

 

[Ntr]

I see somebody just posted about the 1 vs 2 magnets and they can swap one way depending on the driver coil(s).
In my scenario the magnets are strong enough to pull the points closed.

 

[Ntr]

I'll try this again....that magnets gave my multimeter a false reading possibly bending breaker arms. I set the flywheel on lightly to align timing marks. It felt like I needed a puller or crane to get it back off. Nut wasn't installed during this time. What Imam trying to say is that the magnets are RIDICULOUSLY STRONG!

 

[Ntr]

It also "will" run.

 

[oldboat1]

will try it again. Are the laminated arms of the stator and driver coil exactly flush with the edges of the mounting posts? Do the edges feel perfectly flush when you run your fingernail over them.

 

[flyingscott]

You should have 2 sets of magnets for the low tension magneto. That flywheel was only used for 3 yrs so an earlier one won't work. Take the charging coils completely off and see if the magneto frees up. Or loosen them up and push the coils as far back as you can.

 

[GA_Boater]

Sufficient air gap, or is the driver coil or stator binding?

That's what I think. Unless this motor is using super-collider magnets, they aren't strong enough to bend breaker arms.

 

[Ntr]

Yes. The coils are perfect. On the inside of the flywheel there is no rust and no sign of metal transfer. The timing plate does not have any slop.
instead of the single magnet of the 60's this has 2 banks of 3 magnets about 4' leave no if I recall.

 

[racerone]

I doubt that the magnets are bending the breaker arms and closing the points .----They made more than one of these motors and have never heard of this as an issue !!!!

 

[Ntr]

I read leeroy's ramble about trying to remagnetize bad flywheels. This is why I am trying to tell you guys you need a crane to lift this thing off.
Referring to the last paragraph of my initial post the coils are set properly.
The points are set properly. I set the flywheel on and they become erratic when I Ohm them. I tied the plate to set the points so it didn't move.

 

[racerone]

What is connected to the points when you use your meter ??

 

[Ntr]

Points are disconnected and isolated. I set them at 0.020" then Ran a wire through a hole in the plate where the screw is for throttle cam. Disconnected and same procedure for,other side. I could not locate a timing indicator. Was considering cutting a flywheel in Half and making one. This is likely why they don't suggest this procedure after the 50's.
The motor will RUN. Spring on the linkage looks good. All is lubed well.

 

[Ntr]

I have 3 blue motors 40hp late 60's. There are 2 67 selectric 40hp, a 73 selectric, 1976 55, 1979 55, 1979 85, an RDE, two 1957 30hp, a 1973 40 and a turtle on my floor. All of them I can lift the flywheel off with one hand. This 75 will smash your fingers setting. It in place. I guess that answers my initial question.

 

[oldboat1]

So, is the turtle the kind that bites?

'57s would be 35 hp.

 

[F_R]

Never heard of such a thing. You must have the only one with that problem.

 

[Ntr]

Turtle is a '73. And the red one may be a '56.