Modern tranny sprocket seal

Is there a modern lip seal available to fit the gearbox output sprocket on my 42WLA?
Or are we stuck with the old leather ring?
Anyone happen to know a size or number so I can check if my local bearing shop has one before I pull the sprocket off?

[Pa]

If your oem seal is leaking bad, it is most likely because the seal is dry rotted and cracked... or the mainshaft races outer drive sprocket seal surface is deeply grooved through many years of use. NOS oem seals are still very good if warmed up good before installing the sprocket onto the mainshaft. I now heat them up to roughly 175 degrees before installing them. The heat seems to make them plyable again.

If your oem seal is leaking bad, it is most likely because the seal is dry rotted and cracked... or the mainshaft races outer drive sprocket seal surface is deeply grooved through many years of use. NOS oem seals are still very good if warmed up good before installing the sprocket onto the mainshaft. I now heat them up to roughly 175 degrees before installing them. The heat seems to make them plyable again.

That is interesting. Do you heat them up in oil presumably?

Still would like to find a standard seal as parts take 3-4 weeks to get from the US to the remote part of Oz where I live, but we have a local bearing supplier with a good stock of lip seals.
I am sure my old seal has suffered some rot - it has been in there since I restored the bike 38 years ago.
Just pulled her out of my late father's shed recently and am trying to breathe a bit of life back into the old girl, on a really limited budget both time and money wise.

Not sure how to post pics but I'll give it a try:
Then


Now:

I think it's great you've hung on to the motorcycle. You and the machine don't seem to have changed much. Enjoy the ridin'. I'll look to see if the aftermarket seals I have are numbered.

Nice bike, Hopper. I recently had to change my tranny sprocket seal for the same reason, dry rotted.

[Pa]

Very nice bike ! You have just the Bro in your neck of the woods [Australia]. Email Tony at redfernmotorparts@bigpond.com . I am certain Tony will have the nos seals. Ask for an nos sprocket instead of just the seal. The seal will already be installed in the nos sprocket. To answer your warming of the seal question....no....I do not warm them in oil. The nos seals, and or the nos sprockets, are coated in cosmoline, and.... to remove the vast majority of this preservative, the heat accomplishes that task and simultaniously enhances the softening process to boot.

Very nice bike ! You have just the Bro in your neck of the woods [Australia]. Email Tony at redfernmotorparts@bigpond.com . I am certain Tony will have the nos seals. Ask for an nos sprocket instead of just the seal. The seal will already be installed in the nos sprocket. To answer your warming of the seal question....no....I do not warm them in oil. The nos seals, and or the nos sprockets, are coated in cosmoline, and.... to remove the vast majority of this preservative, the heat accomplishes that task and simultaniously enhances the softening process to boot.

Cool.

I think it's great you've hung on to the motorcycle. You and the machine don't seem to have changed much. Enjoy the ridin'. I'll look to see if the aftermarket seals I have are numbered.

Thanks.
Mmmm, but like the bike, I am bit tireder in the second pic.

I couldn't find any sprocket seals in my 45 stuff, just clutch gear seals, no numbers. The bearing supply outfits usually have seals listed by dimension in their catalogs so if you had a way to measure the od of the boss on the side cover and the id and depth of the counterbore in the sprocket, you should be able to purchase a seal.

The stock sprockets have a seal retainer in them, a stamped steel shim of sorts. Why, who knows, perhaps a change in seal standardization or such. I would not worry about the OD, find a seal that fits the boss on the end cover and make your own "seal retainer" to fit the OD to the sprocket.
Robbie

The stock sprockets have a seal retainer in them, a stamped steel shim of sorts. Why, who knows, perhaps a change in seal standardization or such. I would not worry about the OD, find a seal that fits the boss on the end cover and make your own "seal retainer" to fit the OD to the sprocket.
Robbie

That is probably what I will end up doing. I have access to a lathe.
Guess I have gotten spoilt over the years riding modern bikes and just can't tolerate oil patches on the garage floor. Even my Ironhead is not allowed to do that.
Though, the old Walla is something special.

My goodness you washed the old girl, must be first time yeeeears, looks good, big red is near on all done.