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General => General Douglas Discussion => Topic started by: GreenElephant on 19 Jan 2026 at 17:49

Title: Unknown silencers for Mark Series
Post by: GreenElephant on 19 Jan 2026 at 17:49
Can someone assign this short silencer to a motorcycle model? A few weeks ago, I bought a small spare parts warehouse for the Douglas Mark 1 to 5 from a private seller. Two of these silencers for the exhaust system, unknown to me, were also included here. The seller assured me that these would also have been available for the Mark series. The silencers fit with clamp to the original exhaust pipes of the exhaust system. The silencers are about 305 mm long, and have a diameter of about 58 mm.  In the middle, a key figure is 0700649 struck. But I have no idea to which Douglas model they should belong? I am very grateful for any information on identification.

All the best from Bavaria/Germany

Rudolf
Title: Re: Unknown silencers for Mark Series
Post by: EW-Ron on 19 Jan 2026 at 21:57
I'll start by saying I have no idea !
What does that text say - can't quite make it out ?

From the short stubby exits, could these be intended for fish tails (clamped on) ?
Title: Re: Unknown silencers for Mark Series
Post by: eddie on 20 Jan 2026 at 09:20
These are NOT original equipment for postwar Douglases - they look like aftermarket/ customising items for some other make of machine. The larger silencer in the photo (with B-U-R-G-E-S-S embossed on it) was the standard pattern (for Douglas machines fitted with barrel silencers). They came in 2 sizes - one for the standard road machines (Mk4,5 and Dragonfly) and a longer version with a larger tailpipe for the Mk3 Sports. Earlier machines (T35 and Mk3) had the cast alloy 'woffle box' silencer (which was also an option on Mk4 & 5 machines).

  Hope this helps,
                          Eddie.
Title: Re: Unknown silencers for Mark Series
Post by: Vitesse on 20 Jan 2026 at 12:41
Those look like standard Burgess silencers.  Often seen on Triumphs.
Title: Re: Unknown silencers for Mark Series
Post by: GreenElephant on 20 Jan 2026 at 18:40
Hello Douglas friends,

Thank you very much for your answers. I also had doubts that these silencers belong to the Mark series. Now I'm sure these don't belong to Douglas motorcycles.

Best regards
Rudolf :D