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can you identify this cylinder

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grumit
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Joined: 21 Dec 2015
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PostPosted: 08:40 - 23 Dec 2015    Post subject: can you identify this cylinder Reply with quote

can you identify this cylinder,i have 2 of them in my workshop[/img]
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RhynoCZ
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PostPosted: 09:05 - 23 Dec 2015    Post subject: Reply with quote

Definitely a 4 stroke and around 1950's, UK made I presume.

EDIT: Could it be a '53 BMW R25/2? Thinking

https://www.bmbikes.co.uk/photos/schemephotos/R%2025_2%20bd06.JPG
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Last edited by RhynoCZ on 09:55 - 23 Dec 2015; edited 2 times in total
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Suntan Sid
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Joined: 07 May 2009
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PostPosted: 09:47 - 23 Dec 2015    Post subject: Reply with quote

What bore is it?
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stinkwheel
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Joined: 12 Jul 2004
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PostPosted: 10:40 - 23 Dec 2015    Post subject: Reply with quote

Well, it's an OHV pushrod engine and the rounding of the fins on the non-pushrod side suggests a single or vee/opposed.

The heavy flange at the base looks like it'll be quite distinctive. As does the fenestrated top flanges.

I think RhynoCZ is close but with there being two of them, I'd suggest they are off a boxer engine.

With the caveat that I perhaps detect a certain ural-ness about the standard of finish on that bottom flange.

I'm plumping for an Ural.

Yes. Here we go.

https://russianmoto.com/sites/default/files/products/291.jpg
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RhynoCZ
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PostPosted: 10:52 - 23 Dec 2015    Post subject: Reply with quote

As OP never said the two cylinders were from one motorcycle, I'll stick with the BMW. Also as Ural is a BMW copy (the story was: a Russian spy stole the blueprints in the BMW factory. Well, after the fall of the USSR they admitted, they bought them), Stinkwheel might be right, if the two cylinders came from one engine.

A very high resolution picture (5000×3333) of the r25: https://www.motorcycleclassics.com/~/media/Images/MCC/Editorial/Articles/Magazine%20Articles/2013/01-01/Singularly%20Perfect%201953%20BMW%20R252/1953-BMW-R25.jpg

+
https://www.bmbikes.co.uk/photos/photophotos/bp0031.jpg
https://farm3.static.flickr.com/2644/4161778739_4caf0666d4.jpg
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