Charging stator /rotor issue
- Thread starter Jwooky
- Start date
SKOGDOG
One of the old ones.
I had a rotor fail and had to replace it in Dallas. Lucky I made it to Stroker's and they had one in stock. The bike ('08 K9) had about 60K miles at the time. Mine still had magnetic too, but it was bad--never did figure it all out. But it's been flawless since.
It has all taught me that it wants a new battery every year...regardless.
It has all taught me that it wants a new battery every year...regardless.
The magnets do wear down. If the magnet gets worn down over time and when the distance is too much it won't allow for the electricity to generate.
In Rick's example above I was at Strokers and his magnet was very well worn. It was the OEM rotor and Id say it probably only had about 50% of the height of the magnet when compared to the new one.
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That's rather an odd one...seems something else at play but won't argue with what worked for you.
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heybaylor
Active Member
?? how does the magnet wear ? there is no contact,just spins in the air.
maybe if a foreign object got in the air gap ?
Heat too..
Also it's very possible that your new stator isn't sized to the rotor right. Meaning the air gap between the two is too large. Your new stator may be a bit smaller than OEM, and subsequently the matching rotor to your stator would be slightly thicker?
There is varying sizes cause manufacturer want you to buy both parts!
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Last edited:
Jersey Big Mike
100K mile club
Magnetic fields are effected by heat -- this scenario makes perfect sense.
Personally, If I have to replace a rotor or stator I do them as a SET, it's almost always a better bet.
Why would even a bad stator make the bike quit running? You can unplug it and it will still run, until you drain the battery. But that means it was never working in the first place.
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Jersey Big Mike
100K mile club
DIdn't by chance get a 38A stator vs the 32A -- I know the stator/rotor combo for the 38A compufire is a little different dimensions than stock -- vaguely remember a note about space in the install instructions.
As more posts have said -- paired is always a safer bet.
Jersey Big Mike
100K mile club
Well, if the regulator was damaged at the same time (in an odd method) or a really bad design and it was placing a LOAD on the electrical system you can create that failure. With our bikes EHC being soo sensitive to voltage levels its not beyond the realm of possibilities.
heybaylor
Active Member
Hmm, guess I now have another maintenance item, clean magnets every primary oil change
Jwooky
Well-Known Member
So after some research, talking to Curtis@WSW @KaptinAmerika the BDM stator and rotor is a proprietary 24 coil design. The aftermarket/Harley is 12 coil.
The 12 coil rotor is larger diameter than the 24 BDM.
Looking into if it’s possible to grind out the primary to accept the 12 coil rotor. Curtis said he has done it many times so I believe it to be true. I will,update when I have an opportunity to do so.
View media item 9527BDM 24 coil stator
View media item 9526Compufire aftermarket/Harley Stator
View media item 9528Compufire aftermarket/Harley Rotor on left, BDM on right.
The 12 coil rotor is larger diameter than the 24 BDM.
Looking into if it’s possible to grind out the primary to accept the 12 coil rotor. Curtis said he has done it many times so I believe it to be true. I will,update when I have an opportunity to do so.
View media item 9527BDM 24 coil stator
View media item 9526Compufire aftermarket/Harley Stator
View media item 9528Compufire aftermarket/Harley Rotor on left, BDM on right.
Just gotta grind the bosses off the inner primary not too bad a job.
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