Lucas motorcycle Dynamo checked for output and discussed. 

It is admirable that magdinamo works perfectly, even with sawdust that dries out the lubrication. There is no sparking between collector and brushes, indicating perfect isolation between the collector lamellae and grounding between the housings, in addition to indicating that the liming of the collector in relation to the shaft has not been changed, indicating that the winding has not been changed. With the D+ output and the F+ field with full excitation, without going through the field resistance, it is producing a good load, being able to turn on the 12 lamp since there is no voltage control regulated by the field resistance or the regulator. After this cleaning and lubrication service, this magdynamo was in perfect condition to maintain the motorcycle's electrical consumption for a long time. A new battery is necessary so that the regulator is not damaged due to the lack of internal resistance in the circuit and therefore the dynamo. Another quality service from Performance Classics!

The MCR type mechanical regulators are good at killing dynamos. Also using a battery that's too small also burns out regs and dynamos. The makers and repairers tell you to use a battery no less than 10 amp hour. This means that 4.5ah miniature batteries in a dummy battery case is far too small and need to be doubled up inside the case. Also a good solid state regulator is the way to go these days, and they fit inside the MCR housing.

I have the dynamo out of the A10 to paint at the mo, i must test it with this battery charger method and see how it is. Probably dodgy bearings at least i would expect.

Fascinating. Thanks Paul.

Good one Paul thank you

Thanks Paul!

Chuck key left. In chuck? Naughty Paul!

Great testing Paul...guess I’d better do mine...lol

All the dynamos I've motored seem to rumble even though the bearing are A1. I think it's some sort of magnetic reaction because they spin silently when turned with a drill.

"Lucas," Prince of Darkness. 🤣

Hi Paul , I have two old bikes BSA AND Matchless singles with dynamos but they haven't Ever had the wiring for the dynamo hooked up while I've owned them , can you tell me if I can install my magdyno and run the engine without any wires hooked up to it ? Previously had no gear , or will it damage something? Sorry to ask but that sort of stuff isn't written in any books I've got , hopefully I can get it wired ok with new DVR2 it's going 12v conversion armature etc . Cheers

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Take that chuck key out of your lathe chuck!!