Alternator replacement

Previously David Cooper wrote:

Years back I swapped my damaged 3 wire stator for a new two wire one. I had no issues with fitting.

My bike also (oddly) came with the wrong (small) rotor. I think they are unobtainable - but can be remagnetised. I'm fairly sure you will do someone a favour by selling it on.

As I (and you) found out - the small rotor gives no charge worth having in the large stator.

Regards

David

THanks David...but the stator is also old and is matched to the 70mm rotor...so it wasn't a case of the gap being too great

regards John

Previously john_holmes wrote:

BUT it has more than three mounting holes...so will this fit the RM15 housing???

The later ones have 5 holes, you just use the 3 that suit to get the cable routing you need and the remaining 2 are redundant.

THanks John, that's excellent and another problem resolved.

regards John

Previously Phil Hannam wrote:

The later ones have 5 holes, you just use the 3 that suit to get the cable routing you need and the remaining 2 are redundant.???

Checkout the attachment ..........generally the replacement stators have 6 holes. 5 or 6 holes should make no difference. The extra holes will allow you to position the output cable well away from the chain run.

THanks Phil, so long as it fits that will be fine.

regards John

Previously robert_tuck wrote:

Watching with interest as I have to do a similar upgrade on the 67 Atlas.

OK Robert, decisions made...

the electrics have already been changed from 6v to 12v but the original single phase 3 wire alternator setup retained and using a Boyer Powerbox ( none of my doing as have only just obtained the bike)

the 62 model had the smaller 70 mm rotor...seemingly not available now and why go back to 6v anyway!....So the upgrade starts by going to the 74 mm rotor which is Lucas RM20 LU54202299 and fits the 19mm shaft...and appears to be correct for a selection of stators.

the chosen stator is Lucas RM21 LU47205 which is 12v single phase 2 wire rated at 10amps....and has the wider selection of mounting holes(as per my earlier query)

When parts arrive and if any problems I'll post details.

regards John