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Pic three
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Picture 2
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Identifying Douglas Motorcycles / Re: Barrel identification
« Last post by BernardsE31 on 14 Mar 2019 at 17:05  »
Thanks for quick comments.
It make sense for a late Aero 600 with shorter stroke and big bore.
Heads looks also quit "modern" - they dont have the cooling plugs.

Thanks Bernd
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Identifying Douglas Motorcycles / Re: Barrel identification
« Last post by Doug on 14 Mar 2019 at 16:35  »
Oops, my mistake. I was looking at the bore figures for the earlier 82mm stroke engines. The 500 and 600cc Aeros were 68 x 68 and 74 x 68 respectively. Previous post updated.

-Doug
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Identifying Douglas Motorcycles / Re: Barrel identification
« Last post by eddie on 14 Mar 2019 at 16:22  »
They could be 'Aero' as the spec sheet for the DC/38 model lists the bore size as 74mm.

  Regards,
                Eddie.
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Identifying Douglas Motorcycles / Re: Barrel identification
« Last post by Doug on 14 Mar 2019 at 15:01  »
The shape is as for the 1936-38 500/600cc Aero models. However those were not offered as a 750cc to the best of my knowledge. Just 60 and 68mm bores (68mm stroke).

-Doug

Correction, Aero models & stroke: 68 x 68 and 74 x 68.
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Identifying Douglas Motorcycles / Barrel identification
« Last post by BernardsE31 on 14 Mar 2019 at 12:59  »
Hi,
have a pair of barrels and believe the should suitable for a 30s models.
Bore is quit large with around 75mm.
Location of ports are oposite aand not as for S6/T6 models.
Its not Mastiff as well.

Any idea?
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I need a pair of complete Dragonfly rocker assemblies, can anyone please help ?
The pair i have look as though they are off a Mark.
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Hi, I don't suppose you still have the dragonfly rocker assemblies do you? Cheers Matt
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