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1885 Virago XV 700 Magneto Question (SOLVED)

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1885 Virago XV 700 Magneto Question (SOLVED)

PostAuthor: njmikec » Wed May 23, 2018 4:14 pm

1885 Virago XV 700

Recently converted the starter on this old gal over to the bendix-style from an 1986 1100. The good news is, all starter problems are now gone but so is the spark.

Before doing the conversion, I had spark for both cylinders.

After the conversion, no spark so I'm fairly sure the magneto is generating no voltage. In fact, I'm very sure since I measure 0 volts from any of the three white wires coming out from under the cover and ground on cranking. I made sure the coils weren't damaged. Coils all measure 1.2 ohms.

As a note, I had to turn the spacer under the coils on a lathe to achieve the same coil/magneto engagement. Using it at the height it was, the coils actually contacted the rivets inside the magnet/flywheel and and I couldn't bolt the cover on.

I measured the old cover edge to coil top and basically cut down the spacer to achieve the same height +/- 1/2 mm.

My question is, how critical is the coil placement relative to the magnets? Would 1/2 mm cause it to generate 0 volts?

Thanks for reading! Mike

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Re: 1885 Virago XV 700 Magneto Question

PostAuthor: njmikec » Wed May 23, 2018 6:39 pm

Ok, I think I solved my own problem - BY THINKING!

So, after opening it back up it occurred to me that I raised the coil the right amount but never considered this half-moon thing.

I am going to raise it the same amount as the coil but can anyone tell me what this thing does?

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Re: 1885 Virago XV 700 Magneto Question

PostAuthor: turbodog » Wed May 23, 2018 6:57 pm

It supplies the spark control module with crankshaft timing pulses. Yes, space it out to realign with the steel rectangle welded to the matching outer diameter of the flywheel/rotor.
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Re: 1885 Virago XV 700 Magneto Question

PostAuthor: njmikec » Wed May 23, 2018 7:42 pm

turbodog wrote:It supplies the spark control module with crankshaft timing pulses. Yes, space it out to realign with the steel rectangle welded to the matching outer diameter of the flywheel/rotor.


Back to the lathe to make some more spacers...will report back with results. Thanks turbodog! Hoping distances are the same...we'll know soon enough.

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Re: 1885 Virago XV 700 Magneto Question

PostAuthor: njmikec » Thu May 24, 2018 2:55 pm

turbodog wrote:It supplies the spark control module with crankshaft timing pulses. Yes, space it out to realign with the steel rectangle welded to the matching outer diameter of the flywheel/rotor.


The spark is back! For posterity, everything has to be raised up off the case exactly 1 Centimeter.

Thanks again for your help turbodog.

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Re: 1885 Virago XV 700 Magneto Question

PostAuthor: mark75 » Thu May 24, 2018 5:07 pm

wow, and I thought my bike was old!
you really had to plan ahead for fuel stops in 1885 :rimshot: :naughty: :poke:

just yankin' yer chain. I will put this as solved.
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Any day above ground is a good day.
so Laissez les bon temps roulez. just roll safely --- Semper Vigilans...always watchful

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Re: 1885 Virago XV 700 Magneto Question

PostAuthor: njmikec » Thu May 24, 2018 8:16 pm

mark75 wrote:wow, and I thought my bike was old!
you really had to plan ahead for fuel stops in 1885 :rimshot: :naughty: :poke:

just yankin' yer chain. I will put this as solved.


Thanks for setting as solved. (Much thought went into this.)

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