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Miller magneto

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Miller magneto

Post  Graham M on Sat Jun 17, 2017 10:59 am

Hi all,
My 1938 Cruiser has not been run for decades and I don't know if the magneto is working and someone has fitted an external condenser to it.
Should I dismantle it to lubricate the bearings and check out if there is anything obviously wrong with it or hope for the best, though timing it again wouldn't be fun.
Not sure if the original Miller coil works either but doubt it, would a 6 volt car coil work or what aftermarket coil is the same size.
Thanks for your support so far.
Graham
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Magneto ???

Post  piston 197 on Sat Jun 17, 2017 12:10 pm

There should not be a "Magneto" on this engine ??
it should have have a flywheel generator with Miller dynamo and coil ignition with points to provide a break point for the spark timing. Power for the spark coming from the battery and the dynamo is there to provide the charging system for the battery

I am guessing the external dynamo has an external condenser fitted to the points circuit ?,

are you confusing a dynamo for a magneto ? or has someone retro-fitted a magneto ?

JH
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Re: Miller magneto

Post  Graham M on Sat Jun 17, 2017 12:22 pm

Thanks for your reply,
My bike dies have a Miller magneto which is original as per the photo from another reply re my oil injection question and behind the oil tank is a solid steel flywheel, not the Villiers magneto.
Having been an Autocycle collector with Villiers JDL motors there is no flywheel magneto fitted.
Thanks for your help.
Graham
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Photos

Post  Graham M on Sat Jun 17, 2017 12:26 pm

How do I post a photo of my magneto and flywheel etc?
Please excuse my 62yo brain.
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Magneto

Post  piston 197 on Sat Jun 17, 2017 12:29 pm

There should not be a MAGNETO on your bike , it should be a DYNAMO with contact beaker points to break the circuit from the battery coil ignition ???

NB if you do have a MAGNETO the plug lead will be coming from this and not from a coil

Do yu have an ignition coil ?? if you do then it is coil ignition and there is no magneto , just a dynamo to provide charging power to the battery , to power the COIL ignition ?

JH
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Dynamo

Post  piston 197 on Sat Jun 17, 2017 12:34 pm

Just looked at the picture from your other thread

YES that is a Miller dynamo with points, you can clearly see the coil in the same picture that is providing the coil ignition and the Dynamo end cap that house the point to break circuit for the COIL ( not Magneto) ignition

I.e. your engine requires a charged battery to provide a spark , it is NOT a self generating Magneto

JH
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Re: Miller magneto

Post  Graham M on Sat Jun 17, 2017 12:45 pm

Thanks so much for your help, I would have been rotating the motor forever trying to get a spark, are in the process of ordering a wiring loom from Bill Mead prior to trying to get a spark.
Any clues re a coil for my 85 year old unit or dynamo recondition?
Regards.
Graham
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Coil and Dynamo

Post  piston 197 on Sat Jun 17, 2017 12:53 pm

Any 6 Volt DC coil should do the job, it has to be DC as it gets direct current from the battery

Dynamo re-conditioning is an expensive job, but would recommend Dave Lindsley at Leominster, if you google him you will find contact details (01568 617750)

JH
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Re: Miller magneto

Post  Graham M on Sat Jun 17, 2017 1:25 pm

Thanks JH but as I live in Australia the postage would be a bit on the high side.
I need to convince my wife that a UK holiday is essential.
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dynamo rebuild

Post  Bigjim on Wed Jun 21, 2017 6:59 pm

An Australian club member from the DOT club says

Magneto repairs in Victoria, 03 5435 3535 he hasn't tried them, but it's worth a phone call
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Magneto ???

Post  piston 197 on Wed Jun 21, 2017 7:03 pm

He may well be able to help, if he does dynamos as well as magnetos
as it is a DYNAMO ( not a magneto )

We sorted out that above, original poster did not know the difference between a Magneto and a dynamo and was trying to spin the engine to get a spark from a dynamo ??
JH
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magdynamo

Post  Bigjim on Wed Jun 21, 2017 7:07 pm

I hope he spun it fast enough. I had my G9 dynamo rewound for 12V. Yes it was in the late 90s and now we just use 6V LED headlamp bulbs. Anyway it blew up twice, overheated. Squeezing thinner wires into the E3L proved too much for the solder, especially as a G9 has the dynamo strapped to the HOT crankcase. Great designing AMC!
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Re: Miller magneto

Post  Graham M on Thu Jun 22, 2017 6:55 am

Thanks again for your help and I did not know the difference between a magneto and a dynamo as everything I have owned had a magneto and not having a battery did not help either.
I am getting Bill Mead to make a new loom for me as mine has perished beyond repair.
Does anyone have any information on the dynamo as I would like to check the bearings etc before attempting to start it up.
Thanks
Graham
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Bearing check

Post  piston 197 on Thu Jun 22, 2017 7:16 am

It is relatively simple to remove the dynamo but repositioning it does affect timing as the points will need to break at the correct time for the spark, so timing it back up will be similar to a magneto ,i.e. the points will have to be set to trigger the coil at the correct time to produce the spark at the correct interval before TDC
To check the dynamo bearings it will be matter of removing the dynamo chain and spinning by hand. also feeling for any play, but if you do this you will have to re-time the point break position to get the timing correct.

JH
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Miller Dynamo

Post  Graham M on Wed Jul 05, 2017 11:30 am

Thanks for your replies,
I had my dynamo and coil tested today and all is well with them so I will install them tomorrow with some luck and can anyone help me with the timing for the 14a motor with battery and points.
When first reading this site I saw a link for tank rubbers for a 1934 Cruiser, does anyone know who this was as they had the cutout for the tank mounted gear lever.
Thanks
Graham
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Timing

Post  piston 197 on Wed Jul 05, 2017 1:08 pm

The 14A engine should be timed with the points starting to break at 3/8" before top dead centre and a point gap of .015 thou

JH
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Re: Miller magneto

Post  Mike Neden on Wed Jul 05, 2017 6:56 pm

Jeff Hunter Engineering do the tank rubbers. As of last years price list they were 64.

Thanks

Mike Neden

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Jeff Hunter Rubber

Post  piston 197 on Wed Jul 05, 2017 7:22 pm

Not the best rubber items, but unfortunately all you can get, accurate reproduction , but not very durable, have seen the ribs wear off their footrest rubbers in a couple of rides, and have had them split, just fitting them. Probably, the "elf and safety" brigade have outlawed the material the originals were made from ?
Having said that I get the tank badge rubbers, seat location bungs, Falcon horn Grommets, Cruiser/Falcon 87 tank cap seal and AMC kickstart rubbers made without problem, but the guy who makes them has been in business for about 40 years and has produced for Ford, Citroen,Alfa-laval etc, not cheap but no issues, so it can be done ?
JH
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Thanks

Post  Graham M on Mon Jul 10, 2017 10:43 am

Will try Jeff Hunter for the tank kneepads, sourced the other rubber parts and an oil tank cap from a local motorbike shop that specialises in British bikes, his father was from the UK and bought a huge amount of war surplus parts, many still in their DOD original packaging and who does repro parts as well.
Thanks


Last edited by Graham M on Mon Jul 10, 2017 10:43 am; edited 1 time in total (Reason for editing : correction)
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Re: Miller magneto

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