Primary plug - metal shavings
Seasoned HDF Member
Joined: Jun 2010
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From: Upstate New York
It's most likely wear between the chain and sprockets. I'd expect that on a new bike, but it seems a bit much for a well run-in machine. How long since the primary oil was last changed?
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Grand HDF Member
Joined: Oct 2006
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From: DFW
6/26/23...
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Grand HDF Member
Joined: Oct 2006
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Likes: 714
From: DFW
Opened up the primary and noticed additional rubbing inside the primary cover that I will have to grind down further - see the top part of the photos with the light.
Also noticed 1 ring gear is in half and next to it is another that is about 75%. Do I need to replace the ring gear again? This would be about the 3rd or 4th one now. Not looking forward to it if I have to as they're not inexpensive.
Pinion gear looked a little beat and will replace that again ~ 3rd or 4th time for this.
These items appear to make up the extra "stuff" on the primary plug.
Also noticed 1 ring gear is in half and next to it is another that is about 75%. Do I need to replace the ring gear again? This would be about the 3rd or 4th one now. Not looking forward to it if I have to as they're not inexpensive.
Pinion gear looked a little beat and will replace that again ~ 3rd or 4th time for this.
These items appear to make up the extra "stuff" on the primary plug.
HDF Community Team
Joined: Jan 2020
Posts: 1,434
Likes: 800
From: Colorado
Would guess either clutch basket bearing is bad, .cocked in basket socket for it, or clutch hub has some inner spines cracked of on the inner end of shaft, that is causing the clutch basket to not run concentric with the trans shaft. Hence either hub not mounting tram with trans shaft, or bearing problems to cause basket to not run tram with inner shaft.
So on that note, pull the primary chain, get the clutch out of the basket, check the parts, put the clutch hub and basket back on the shaft with the nut just hand tight and spin the bracket on the inner hub to see if outer basket has outer basket lip in and out wobble as it spinning on stationary clutch hub. Next with trans in netrual, spin inner hub with indicator on it, to see if it running true next. If now, no, then pulls hub and basket,and put indiecator on shaft to see if it running true, or if it bent.
As for basket with bearing/SHELL & SPROCKET W/RING GEAR (hd 37707-94), may just need to replace it, since the starter ring gear teeth are toasted on it.
The after market units already come with bearing, so just a mater of back up the inner bearing race as you press the center hub back into it.
But will note before you go to press the inner hub back into the basket bearing, check to make sure that C clip 8, is tight to outer bearing race 9 to start with. Any gap between the two, really want to pull the C clip and get a shim in place to keep these two tight. With them not bring tight (like need to use punch to get the C clip to seat into it groove tight), can allow the bearing to oblong the socket for it, bearing **** in the socket from primary chain tension, and cause the basket wobble again as pointed out above on the inner hub.
As for clip 7, same same as well,since it holding the inner hub to inner race of bearing so it does not walk in and out, and none of these are really that tight of interference press fits to start with.
Last edited by Dano523; Aug 13, 2023 at 07:31 AM.
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Grand HDF Member
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From: DFW
Found the issue, the inner primary had a piece broken off by the main shaft - see attached picture. That is where the marks on the inner primary came from as this piece was stuck behind the clutch.
1) Is this even repairable?
2) I have a second inner primary, but it would have to be drilled out for the mid control shifter shaft.
1) Is this even repairable?
2) I have a second inner primary, but it would have to be drilled out for the mid control shifter shaft.
Thread Starter
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Grand HDF Member
Joined: Oct 2006
Posts: 3,665
Likes: 714
From: DFW
Found the issue, the inner primary had a piece broken off by the main shaft - see attached picture. That is where the marks on the inner primary came from as this piece was stuck behind the clutch.
1) Is this even repairable?
2) I have a second inner primary, but it would have to be drilled out for the mid control shifter shaft.
1) Is this even repairable?
2) I have a second inner primary, but it would have to be drilled out for the mid control shifter shaft.
3) Did this walk out or am I seeing things?
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Stellar HDF Member
Joined: Aug 2020
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From: College Station, TX
Looks like it did walk out, but you need to take things apart to see what parts are damaged. I suspect the bearing seized, but until you take it apart and inspect everything, you won't know what else may be damaged.
Paul
Paul
HDF Community Team
Joined: Jan 2020
Posts: 1,434
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From: Colorado
bearing installs from the back side of the case.
So need to figure why the bottom of channel socket side was cracked, and allow the bearing to come out that side.
Either bearing seized, primary chain was too tight, trans shaft bearing gone, or something else like high torque and not running a comp.
Hence note that the bearing channel broke to the comp side of the channel, so almost screaming that primary chain was too tight.
Are you running an automatic primary chain tensioner (instead of the manual tensioner), that may have cause the chain to become too tight in the first place?
Last edited by Dano523; Aug 14, 2023 at 12:13 AM.