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Prewar transmission gears - R11
Prewar transmission gears - R11
I see random replacement gears here and there, so someone know what's up. Hopefully they're on this forum. Thanks....
- Darryl.Richman
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Do you have a three or a four
I don't know anything about gear cutting, but I bought a replacement 2nd gear, input shaft and output shaft from Josef Heft for my R52. I got them as spares so I could use them in case I had a problem with my R52 on the Motorcycle Cannonball in 2014. When I first ordered these parts, Heft had them in stock, but the inner splined hole on the 2nd gear wasn't sized correctly and had to be opened up slightly to fit on the shaft. Now everything fits and it all seems to be hardened - though I've had problems with parts (from other sources) not being hardened correctly and thus wearing out quickly.
I have the 3 speed. It is
Does Josef have a website or means of contact or does he even want to be contacted? ha ha. I'd love to see if he can help.
Thanks, Darryl
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- Darryl.Richman
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That's very interesting!
Heft seems to specialize in parts for the prewar tunnel cast motor bikes(R5 onwards), but he has a few parts for split case motors. The last catalog I saw from him, perhaps 2 years old now, didn't have a first gear, just the input shaft. But it is a stock item, like the one in my photo, so it probably won't help you.
You might contact Torsten Tausch in Berlin, he has a lot of specialty items for split case motor bikes. www.torsten-tausch.com. Actually, I was just verifying that link, and I see he has part of a constant mesh 3 speed box pictured on his home page. He's probably the person you need to talk to!
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The parts book shows 1st gear
My late model R11 has this type of gearbox, I believe it came in with series 4. I only have experience with one other early type gearbox (R62) and this later version changes easier and runs with very little whine, generally much nicer. The downside is I don't know of any suppliers doing the differing parts this version uses.
Please post any parts supply info you get.
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- Darryl.Richman
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Crash box requires double clutching
A constant mesh box will certainly change easier. I have to double clutch every shift into 2nd, whether from 1st or 3rd, to get it smooth.
protogear
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- schrader7032
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Wow! Everyone should have a
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- Darryl.Richman
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That is a wonderful idea! I
I have had the thought in the back of my head that developing prototypes with 3D printing could overcome problems in making reproduction parts. In particular, if you need a floorboard for an R12, which is cast aluminum, you find that the reproductions don't fit. This is because they seem to have been made by using an original floorboard as a mold to do sand casting. But liquid aluminum shrinks by about 10% when it cools, so the resulting floorboard isn't right. If someone scanned an original floorboard, then printed it at 110%, it would make a better mold for reproduction floorboards.
more printing
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