evinrude rbm coil test and repair

[keplerfan]

so i have been restoring an evinrude rbm. one ground wire pulled out of the coil underneath the black concrete stuff. i dont know if it is repairable or even works. is there anyone out there who tests and repairs these coils or is there anywhere i can find the info to do it myself?

[eltoquad]

It seems about 90% of the coils in those motors are bad and don’t know of anyone that works on’em. I did have one rewound 20 or more years ago and it cost a bunch even back then. Most guys convert them to "battery and coil" ignition if they’re going to run them.

[The Boat House]

There is a guy, not to far from me,
that services antique tractor and
gas engine magnetos. Just sent
him an email asking if he has any
experience with the RBM coils,
if he does, what is the cost, and if
not would he be interested it taking
on one. Where he is located he
likely farms and will be busy for the
next few weeks. He’s about 50 miles
from me but less than 25 from a
buddy’s place that I go to every Friday
night. If he is interested I can easily
run out there one Friday with a
coil to hear what he has to say.

[chas56x]

Why not just buy a new one?
Get one here: douglas.penn@gmail.com.

[kees]

quote chas56x:

Why not just buy a new one?
Get one here: douglas.penn@gmail.com…

I know, Doug has a lot of parts for several outboards but…..
a ..NEW..! Evinrude RBM coil ???
wish it was true !
I think you have been mistaken

[The Boat House]

quote chas56x:

Why not just buy a new one?
Get one here: douglas.penn@gmail.com………

At one time Doug was offering a new Super Elto coil.
I don’t know if that is still the case.
I’ve never had one of the RBM coils out but it looks
like the primary and the secondary are wound on
separate laments between the shoe’s. I wouldn’t
think it would be difficult to rewind them for
someone that has the equipment to do that but
there is often a big difference between thinking
and knowing. Epically in my case.

[kees]

quote Tubs:

quote chas56x:

Why not just buy a new one?
Get one here: douglas.penn@gmail.com……………

At one time Doug was offering a new Super Elto coil.
I don’t know if that is still the case.
I’ve never had one of the RBM coils out but it looks
like the primary and the secondary are wound on
separate laments between the shoe’s. I wouldn’t
think it would be difficult to rewind them for
someone that has the equipment to do that but
there is often a big difference between thinking
and knowing. Epically in my case.

I have one rewind, just for my self
I know a guy in the Netherlands who has the skills to do this work
normally, it is always one coil but in this case, two coils in a
120 degree ( ? ) angle and connected with each other !!!……….

he took it as a challenge

first , you have to make a tool, to fit it properly into your machine
second , you have to deal with the unbalance when it turns around

and yes , it was a bit expensive
( what the heck )

[The Boat House]

quote Tubs:

There is a guy, not to far from me,
that services antique tractor and
gas engine magnetos. Just sent
him an email asking if he has any
experience with the RBM coils,
if he does, what is the cost, and if
not would he be interested it taking
on one. Where he is located he
likely farms and will be busy for the
next few weeks. He’s about 50 miles
from me but less than 25 from a
buddy’s place that I go to every Friday
night. If he is interested I can easily
run out there one Friday with a
coil to hear what he has to say.

I got a reply from him. He doesn’t rewind coils.

So-

[joecb]

Tubs, thanks for the investigation and the effort to post the pix. This "story" should go into a "Outboarder" tech article…. the Mystery of the Evinrude RBM Coil solved.

Joe B

[george-emmanuel]

Some time ago when I was first getting started in this hobby I acquired a MightyMite with a dead coil. I was in the equipment rental business at that time and had a lot of sources for repair parts. NAPA had, and still has, a small engine division in their catalogs and I was able to get one of their paperback catalogs. (Incidentally you can get a paperback catalog for their marine engine division also and it is a wonderful reference tool for seals, coils, condensors etc.) In the catalog it has pictures for those of us who are impaired in mental vision 🙂 and I found what I thought would work, bought it and discovered it fit loosely on the laminates of the old coil. I used some thin cardboard to "fill in the gaps" and I had hot spark and still do after 30 years!.

In looking at that core once the coils were removed, I’m wondering if a small engine coil could be installed over the laminates on one side of the "V"?– or cut the laminates and fit in a coil from a single cylinder? I’m not sure a coil would have to be located in the center of that "V" to work. I think it would work regardless of its location. Fortunately you have something to experiment with that most of us don’t regarding RBM mags. The coil from a Johnson A or K series might fit perfectly in the recess and it is a single cylinder coil.

[Author]

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