1922 Zenith with a vertical rotary sleeve valve head

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1922 Zenith. Rider in shot is Ian from Verralls classic motorcycle shop.

We asked Ian about the bike and this is what he told us: "The bike was originally fitted with a J.A.P or Blackburne engine. The engine is now a modified 1900 De Dion bottom end, barrel and piston. We think it was built in the late 1920s. It has a water cooled cylinder head of unknown manufacture. Radiator forms the front of what would usually be the fuel tank. The head incorporates a vertical rotary sleeve valve. This is chain driven from the crank shaft via a pair of skew gears.

Location is the Sunbeam 100 event at Brooklands Museum, Weybridge, Surrey, England, UK.

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// A BIG THANK YOU TO
- Ian for showing us his bike and being in the video.
- Hayley and the team at Brooklands Museum and Martin, Perry and the rest of the Brooklands Motorcycle Team for having us along on the day.
- Julie Diplock for organising and inviting us along to the day.
- Alex Rollings for producing the video.
YouTube: @motofilmer
Instagram: @motofilmer

#motorcycles
#zenithmotorcycles
#vintagemotorcycles
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Lovely bit of old kit!. Probably the only one 'out and about!'. Nice one, Nuff said!. 🙂

robleary
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Mike Hewland solved the smoke issue in their Bristol type of SV engine with a Dykes ring on 'junk head'

josega
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Why does a 4 stroke smoke so much? Does it have lost oil system?

Guzzbang
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