Leaderboard

Nothing special Norm. Fan fixed to Sprocket on the Crank. Fan for additional cooling due partially enclosed compared to the exposed situation it would normally be in when fixed to a motor bicycle. Had to check the 172cc engine out in the Books. That was an up-rated engine first produced in 1924. The first prototype engine went to a French Racing team (Monet Goyon) and it powered them to winning the French GP of that year. Known as the 'Sports' initially, then 'Sports' with the Auto Lubrication system, then Super Sports T.T and lastly the 'Brooklands'. However, I digress. This engine is the first 2 stroke 269cc engine designed and built by Villiers (in 1913). Fitted to a multitude of Motor cycle makes, direct belt or chain drive initially. Known as the Mk I (should be roman numerals) up to 1916, then Mk II, Mk III. Mk IV is claimed to be the first introduction of their Flywheel Magneto, as prior to this, they used an external chain driven Bosch Mag, but the war got in the way of supply. This engine, the MkV was discontinued from Sept 1922. They built 3 other engine designs (from 1923) - 150, 250 and 350cc as the Mk VI. So everything hangs on this being in working order. It is complete and has the original Carb with it. Also has the Villiers patent Free Engine Clutch. All these bits will need to work ok when fixed. Good news is that my concoction of fluid for loosening bit up worked on the siezed piston/crank after just 1 hour ! and found it was 'freed up' by accident !. So need to remove that nut on the end by the Fan first without any stress on the crank, then pull the cylinder to check the bore/rings and piston. Might have a source of used spare parts too. Also may have a replacement option for the HT Coil (same style).

That is an Allen scythe engine with the gear on it

+ 1 Norm, Only just logged in to find you had aged over the weekend !. I don't have birthdays nowadays, just an anniversary Beer (Badgers Fursty Ferret) or a Cider (Frosty Jack). Belated best wishes anyway.

But its not a chain driven fan, just happens to be on the crankshaft that's driving something else. Similar arrangement that used on several old mowers such as Atco Standards.

happy belated birthday Norm!