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ID for Dad's 1930s machine please

Posted: Thu Jan 05, 2017 10:43 am
by Sidevalve Syd
Photos clearer if you tap on them.

These are the only two photos I have of this machine. I have not cropped them but they could do with more detail. Date is thought to be early 1930s. Dad also ran a two stroke Baker in trials at this time but this bike engine somehow does not look like a two stroke. The frame is very light for the size of engine. Twin exhausts starting high up. Looks like an oil tank? Unable to make out the tank logo, the photo is not fine enough.
Interested in any opinions.

Re: ID for Dad's 1930s machine please

Posted: Sat Dec 09, 2017 10:22 pm
by srob
I think it looks like an OK Supreme. They had the horizontal frame tube to the rear wheel and a similar looking tank badge.

Re: ID for Dad's 1930s machine please

Posted: Fri Dec 22, 2017 12:36 pm
by Rick Parkington
I see why you suggest it might be an OK but I'd say it's more likely to be an OEC. The giveaway is the plunger type rear suspension (it's actually swinging arm) and if you blow up the image you can just about make out the large E on the tank. This suspension is more usually seen on the duplex fork models - if you google OEC images you'll see what I mean. Date would be somewhere around 1930 I'd guess; they made a few girder fork models with this back end in the 1933/34 period but these seem to be foot-change, the hand gear-change right at the front of the tank suggests it's earlier. OEC info is a bit scarce and they were only a very small company anyway so there were probably a lot of variations in specification.
I'd say the engine is a twin port JAP, maybe 350cc. They did a 250 twin port model but the ports seem to point downward, so I think it's bigger. Nice pic.
Cheers Rick