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The Plunger
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VBMWMO #8356
Joined: 09/03/2012
Posts: 174

Hey gang, I just received a new rotor for my R67/2 and it is different than the other two I had. Namely, the windings extend outward farther on both ends. Now I don't foresee any clearance issues within the generator body but I was just curious as to it's construction compared to most I've seen. What reason would there be to make windings longer? The PO stated it came out of a R51/3 which the L45/60/L is correct.

Brian

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Brian
'52 R67/2, '53 R51/3

johnpst
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Hawaii
Joined: 03/22/2016
Posts: 61
SHOULD BE FINE IF...

Aloha Brian,

The length of the wingdings will result in current carrying capacity relative to magnetic field strength and anticipated speed of the prime mover. More wire, more current potential at lower speed. Less magnetism, more wire required and vise versa. Cooling is an issue to. The conductors have to get rid of heat. Short coils will heat up faster requiring more external cooling, which these bikes do not have. They must radiate the heat, a much slower process so, more wire.

Make sure your voltage regulator works correctly. That will be the key to success if it will physically fit.

You are on the right path. Dimensions are your critical issue here.

1. Insure there are no clearance issues between the engine, stator, and the rotor.
2. Make sure the commutator is fully exposed to the brushes without any rubbing once the stator is installed. The brushes should be closer to the armature but, anywhere close to the center will do.
3. Make sure the diameter of the commuatator is VERY close to the original. There is some wiggle room due to he brushes being mounted on springs. Again, make sure nothing is rubbing and remember, there is some small expansion with heat.
4. Make sure the taper on the crankshaft nose is the same as the generator "dynamo" rotor. Prussian blue is readily available. 90% contact is good.
5. Make sure the seal end is the correct size for the OEM seal.
6. Check the commutator undercut. There should be a very small undercut with chamfered edges for the brushes to ride on.
7. Make sure it is not eccentric. Use a dial indicator for this. It is critical that the brushes remain firmly planted.

Sorry, I don't have any direct comparisons.

John

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John
55 - R50, 06-R1200RT, 96-M900, 10-TU250x

wa1nca
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VBMWMO #8374
Ashfield Ma.
Joined: 09/27/2012
Posts: 305
Rotor

Never seen one like that before
Does not look like it will even fit

Tommy

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

The Plunger
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VBMWMO #8356
Joined: 09/03/2012
Posts: 174
Tommy, It fits fine! Charge

Tommy,
It fits fine! Charge issue is resolved and now she's finally done...just wish Spring was here.

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Brian
'52 R67/2, '53 R51/3

wa1nca
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VBMWMO #8374
Ashfield Ma.
Joined: 09/27/2012
Posts: 305
Great news

Nice job
Well done
May restore my R51/3 but really do like the patina for now
My alternate winter ride
Also can't wait for Spring

Tommy

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

Daves79x
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VBMWMO #9030
Joined: 08/09/2015
Posts: 251
Congrats!

Great work and perseverance! Hope Spring arrives soon.

Dave

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Dave

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