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  #831  
Old 3 Days Ago
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davixlrtt davixlrtt is offline
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Hello RKN, I can get a good spark between the springs on my FM mag but I do have to give it a real good flick between my finger and thumb, I’m not saying by any means that you don’t know how to get a spark out of yours, I’m just saying that’s what I have to do to get one out of mine.
......Davi.
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  #832  
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I made a request to Morris Magneto tech support to find out which coil is a correct one to be used with their rare earth magnet rotor.
Dave Shaw is Morris Magnetos. He's pretty much a one man band. But what he doesn't know about them isn't worth knowing.

I think he has supplied two types of coils to date. One reads 13,000 ohms tower to tower and the other is 17,000 ohms tower to tower. I'm not sure what the original FB measured.

I use a frill and a short length of rubber hose to connect the drill to the mag. Then just ground the two spark plugs against each other. A drill will spin it fast enough to see how good/bad your actual spark is.
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  #833  
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Originally Posted by davixlrtt View Post
Hello RKN, I can get a good spark between the springs on my FM mag but I do have to give it a real good flick between my finger and thumb, I’m not saying by any means that you don’t know how to get a spark out of yours, I’m just saying that’s what I have to do to get one out of mine.
......Davi.
Well, that's a very good news for me. So, such magnetos do exist)))

When I assembled mine at the beginning of the year, I could get a spark in spark plugs by rotating magneto by hand without putting too much effort in the process. I haven't read Dr Dick's post back then, so I do not know if I was able to get a spark between coil terminals back then.

I was getting a solid spark in spark plugs while kicking when I just put the mag on the bike. Then I put the carb on the bike, with a new gasket, but without checking the flatness of the mating surfaces (carb body and bowl). Well, it leaked. And the gas got inside the mag. After that I couldn't get a spark. I removed the mag, completely disassembled it, cleaned out everything, assembled it back. No spark between terminals when rotated by hand and irregular spark when rotated by drill.

There probably will be a spark if I connect the mag to the spark plugs, but since I have $$$ invested in rare earth magnet rotor and MRA adjustable advance, I want this mag to function 100% perfect.

By the way, what's your mag set up? Which rotor and coil are you using?
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  #834  
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Originally Posted by RKN View Post
By the way, what's your mag set up? Which rotor and coil are you using?
I am running a standard XLCH magneto with a genuine coil that I replaced about 15 years ago although it was working perfectly and only because one of the towers had a big chip out of it around the spring, the points and condenser I have no idea of their origin but most likely aftermarket.
......Davi.
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  #835  
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"" RKN "" since you had a good firing mag prior to the gas getting in it I would tend to look at some sort of debris from the fuel causing a short to the points.
I have found this in two spots, one where the isolater block goes between the spring and the mounting plate, and also at the pivot post where the points locate on the plate.

The times I had this happen it caused intermittent spark.
I simply removed the points and cleaned those parts with nail polish remover ( I was at a convenience store ) and blew it dry.
Everything worked great after that.
Oh, and don't forget to lubricate the wear block on the points or you will be back in resetting the points soon, took a week for me ..

Anyway, good luck cant wait to see this thing running.
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  #836  
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Originally Posted by iNSaNeSHaNe View Post
"" RKN "" since you had a good firing mag prior to the gas getting in it I would tend to look at some sort of debris from the fuel causing a short to the points.
I have found this in two spots, one where the isolater block goes between the spring and the mounting plate, and also at the pivot post where the points locate on the plate.

The times I had this happen it caused intermittent spark.
I simply removed the points and cleaned those parts with nail polish remover ( I was at a convenience store ) and blew it dry.
Everything worked great after that.
Oh, and don't forget to lubricate the wear block on the points or you will be back in resetting the points soon, took a week for me ..

Anyway, good luck cant wait to see this thing running.
Thanks, I'll look into it again, but I completly disassebled it (including rotor removing) and cleand everything. I cleaned points with a piece of paper, just like you would clean a micrometer. I got somewhat paranoid after I read that gasoline conducts magnetism. Have no idea if such thing as a "magnetic shortage" exists and if it can demagnetize rotor or do any other harm to it, though. Hope the problem is with the coil.

If I attach a small drill bit to one of the coil springs and keep it within .1-.12" from the other spring, I do get a spark while rotating the rotor by hand, but I can't get any spark between the coil terminals without shortering the distance between them (while rotating by hand).
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  #837  
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I think you're overthinking this. The plug gap is .020" - you're getting a spark at hand rotation speed at 5 times that distance. What's the problem?

I've never had a mag give me anything but intermittent spark from spring to spring.

What is that a half inch across there? It would make sense that it would take a few revolutions to charge the coil enough to jump that.

Just my thoughts ……….
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