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dogwoodfarms
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Anyone recognize this transmission? I have several twins but this one is quite different being without the breather section. Currently attached to 1956 R69. The carbs that came with this machine are delorto vs bing. Thanks

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tonyhutchinson
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Its from a single - maybe R26

Its from a single - maybe R26

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Tony

dogwoodfarms
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transmission

Well, Tony, it does look like it, however, I have a twin and single trans side by side and it is obvious to the most causal observer that they are of a different size, so that not it.

The Plunger
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Is it some kind of lightened

Is it some kind of lightened racing transmission? There'd be no need for an air cleaner housing and tubes as the carbs would be set up with velocity stacks and individual filters. Just my guess.

Brian

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Brian
'52 R67/2

808Airhead
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That may be a super rare

That may be a super rare factory race trans??? Or a trans they shaved down and finished to look like that.

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Thomas M.
R69s - R60/2 - R67/2 - R51/3

tonyhutchinson
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Interesting - I don't think

Interesting - I don't think its a competition box as it has a kickstart shaft

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Tony

schrader7032
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What model single do you have

What model single do you have that you're comparing to? It can't be a transmission from the plunger era...the clutch arm arrangement is completely different to the one on my R25/2. Plus the output flange on my single has the Hardy disk and has two large pegs sticking out. I suspect that the R25/3 is the same.

One the R26, they went to the enclosed driveshaft but included a bell housing around the output flange area. It bolted in at least two locations along the right side near the area of the speedometer cable insert. I don't see that on this transmission.

The R27 seemed to have the shroud as well on pictures I've seen. But I'm wondering if it was dropped later in the run. The clutch lever mechanism on the back of this transmission looks identical to that found on the twins.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

dogwoodfarms
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transmission

I have a bmw r25/3 to compare it to. The 25/3 transmission is nowhere near the size of this one. Another enthusiast has told me it could be a factory racing transmission. Will send photos to the archives and ask. thanks

dogwoodfarms
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ps

I stated in my original post that it is from a BMW R69.

dogwoodfarms
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transmission

I believe you are correct, Tony. The delorto carbs with the flange mounts are similar to units used on BSA and Triumphs. Not the spigot type such as on two Guzzi's I have. Thanks

dogwoodfarms
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oops

I meant Thomas, not Tony in the last reply, sorry.

tonyhutchinson
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Is the port thats visible an

Is the port thats visible an inlet port or has someone put the head on the wrong side -its hard to tell from the photo

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Tony

dogwoodfarms
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trans

the seller is not a bike fan and put the heads and cylinders on mock up.

brownbmw
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So. Cal.
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It sure looks like an R69

It sure looks like an R69 trans with the air filter boss removed. Along with the Del Lorto carbs it supports a theory that it was modified for racing. I would think that there would be visual evidence of the removed boss no matter how well done. Maybe you can see something in person that is not noticeable in the picture.

Daves79x
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I think

I think that upon close inspection, you can see in the photo that the air filter/carb tube mount was indeed machined off.

Dave

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Dave

schrader7032
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It's not easy to tell from

It's not easy to tell from the photo, but I see no evidence that anything has been machined off. If they did, they went to a helluva lot of effort to do that. Just doesn't make sense to spend that effort.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

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