Testing alternator rotor (2011)

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My magnetometer pegs it at about 900 gauss max, but it holds on to a 12" adjustable wrench pretty good. Oh well, another $50 or so for another one on top of the rest of the cost won't be too bad!
 
So who can re-magnetize the Lucas rotors?

Don,
Thanks for reviving this old thread. I had never read it. Perhaps you should check with a magneto manufacturer in your corner of the world. Joe Hunt is rather far away from you. Has anyone has a rotor re-magnetized by Joe Hunt? Or anyone else for that matter? I've never had a rotor explode. However, I have seen the magnets come loose and move outwards, scraping & destroying the stator.
 
Joe Hunt Magnetos is only a few miles from where I live. I have a call in to them now, they're checking to see if the old Lucas rotors can be re-magnetized.

Well, they called back to say the Lucas rotor is too small for them to work with. Said he wd call back if he found anyone to do this job.
 
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I had the rotor for my 68 BSA A65 recharged by Joe Hunt a few years and still works well....when the time came to get one for my 72 T120 I bit the bullet and bought new Lucas rotor and stator for $200...I understand new Lucas rotors slightly too large for old stators...
 
I have 3 older take-off rotors, I am happy to send them off to anyone who is willing to pay the flat rate shipping, limit one rotor per requestor, I think I can get a rotor into a Small Flat Rate shipping box, the domestic shipping is $7.20, international is somewhere, I believe, in the mid $20s.

As Dyno Dave pointed out heat and mechanical intervention diminishes a permanent magnets effectiveness. I don't understand enough about the properties of rare earth to know how effective re-gaussing a magnet is, so I purchase new stator/rotor/reg-rec each time I rescue an old motorcycle and go on and worry about something else.

A side note: With a charging system more isn't necessarily better, balance is better. When you purchase a new charging system it is prudent to add up your watts and purchase a system that covers the electrical draw with a modest extra capacity. The energy that you don't use is converted to heat, your reg-rec is designed to handle the heat form a few extra unused watts, but its useful life diminishes with increase heat dissipation.

There are a number of members on this forum that have electrical backgrounds that I hope will chime in and give us a run down of what kind of draw the various appliances attached to the Norton require, to come up with a menu of suggestions as to what charging system output is appropriate for your Norton.
 
Many old rotors are too loose. We used to take a punch and make indentations in the channel around the hub which seemed make them live a bit longer.
 
Rec'd a used Lucas rotor (54201143) stamped ?-75, from Bill at Rocky Point for postage cost, took it over to Joe Hunt today.

Nice guy with a British? Aussie? accent took it into the side room, came out 45 seconds later, and charged me $35. All I really wanted was to know if they cd measure it's output/condition, but I'm not unhappy. He says it's better now than it was. Says they tell people on the phone that they don't have the equipment, but if it shows up in front of them, they will do it. Unless it's too far gone, and then they send it out (to Midwest, I think) where it waits for 2 months in the queue.
How do they know it's too far gone? I didn't get an answer, but I did get a couple of very cool stickers, upon request.
 

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