My 'Trick' Trials Cub
by Eddy Bicknell

Here's my trials Cub which I bought last year to compete in local trials and in particular to compete in this year's (2020) Arbuthnot trial (unfortunately cancelled due to covid).

When I bought the Cub, the engine was partly dismantled and needed re-ringing. Since then the following modifications have been done:

• Sports Cub head with Dellorto carb
• Updated valve springs
• 7:1 piston and standard camshaft
• Later crankcases with ball race both sides of crank
• Drive-side crankcase modified for Electrex World ignition
• Chain tensioner fitted to primary chain with smaller engine sprocket
• Crankcase and gearbox breathers fitted with non-return valves
• Clutch operating arm modified for lighter clutch
• Rear of primary chaincase modified with removable section to allow change of gearbox sprocket
• Crankcase cut away around gearbox sprocket for mud clearance 
• UPB front forks with Armac aluminium yokes
• Wider swing-arm fitted for clearance on 4" tyre
• Renthal fat arms with Domino levers
• Fast acting brake cams front and rear
• Sammy Miller oil tank acting as stressed member to support swan-neck headstock
• Modified rear subframe to lower seat height 
• Headstock modified to take taper roller bearings
• Aluminium front wheel spindle
• Falcon rear shocks

​​With the help of the TOMCC I have managed to get an age-related registration number, though I did have to fit a new frame loop with a correctly stamped number, as the original frame had been re-stamped.
 
The new frame was apparently originally sent from the factory in 1960 to John Surtees Developments. So it's a mongrel or a trick Cub as they say, but surprisingly nice to ride.