Which way round does the stepped scraper ring go, step up to piston crown or step down to bottom of piston?

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It was in the Whitewebbs Museum, where I saw it in 2003 (below). At that time the sump was off getting copied by someone in the LDMCC.



It seems to be a 1925 Works frame, in that it has the OB style rear fork lugs and brake anchorage. These are seen in other period photos of the factory entries at races. The following year when the model became cataloged and available to general public it had the cast lugs seen on subsequent models. Another 'early' feature is the RA (OB?) style foot peg lugs. They only wrap around the frame tube about 3/4s of the way, and are not the fully enveloping tee-fitting like on the DT models.

The engine is a slight oddity too. The bottom of the crankcase casting is extended and milled off in one great large planer surface.



In all other cases I have seen where the sump is fitted the 'window frame' in the base of the crankcase is a raised spigot. As in this example:



-Doug

I see that Bonhams are offering a 1928 Brooklands Douglas special, 750cc.  ex Rex Judd collection, in their April auction next year. Does anyone know anything about it please?

Thanks that will do me.

0.006"  both according to this amazing response from Doug & the Service Dept.

https://www.douglasmotorcycles.net/index.php?topic=8098.0

Just put my friends Aero engine together and wondering if somebody could tell me the tappet (valve) clearances. Thanks Bruce

This is on my Aero

Most models I can think of did have a return spring. On the ones where the cable is vertical a compression spring is fitted between the end of the cable adjuster and the knuckle of the operating lever. On ones like the S6 and derivatives where the cable is horizontal, an extension spring is fitted between a hole in the operating arm back to a hole through the rear wall of the primary chain case casting.

Picture of the S6 type return spring below.



-Doug

Hi I have a query regarding my Model Z clutch. The clutch disengages well, now I have a thinner friction plate fitted, but my issue is with the Cam operating arm not returning when the cable is slackened. I can't see or feel any groove in the can ramp surface so am wondering if there should be a return spring attached to the operating lever, there is a small hole through the lever. If there should be a spring has anybody got any details regarding its length, shape etc and also where it located in the primary chain case.

any help with this would be welcome.
Chris