All machines to be of British manufacture.

The machine classes are:-


Class A - pre unit springers over 347cc,

Class B - pre unit tele fork rigid over 347cc,

Class C - pre unit girder fork over 347cc,

Class D - unit to 246cc, including Cubs over 246cc (Championship trials only)

Class E - unit over 246cc, (Championship trials only)

Class F - two stroke to 1970, (Championship trials only)

Class G - twin cylinder over 347cc,

Class I  - intermediate class (50/50 route). Up to 50% of the premier sections will be signed to be ridden together with the remaining clubman  sections. (Championship trials only).

Class J - pre unit rigid or springer under 347cc,

Class K - Clubmen on any machine riding the eased yellow route

Class K/S - Specials, machines not fully complying to the  machine class rules on the Clubman route.

Class S - Specials, machines not fully complying to the  machine class rules. (Championship trials only)

Class T - Pre Unit or twin cylinder machines over 347cc ridden on the clubman route. (Championship trials only)

Class V - Vintage two stroke rigid and springer in accordance with club rules.

Class W - The Gentleman's easy route on any machine. Marked by white flags. Championship trials - only the scores from the first two laps will be counted in the results. the 3rd and 4th laps can be ridden for enjoyment if wanted. Pre-unit trials - all laps of the white route will be counted in the results.

Routes - The routes and section standard for each class are given on the 'About us' page.



In line with the club's aim of retaining the spirit of the sport as it was in the 60's, machines must retain a period appearance but some alterations are allowed to improve reliability, performance and safety.


Main Frame Loop

  • Main frame loop to be retained as original but may be strengthened. Replica frames are accepted but must be recognisable as the original.

  • Petrol and oil tanks can be repositioned.

  • Any colour change allowed.

Rear Sub Frame And Swinging Arm

  • Rear sub frame can be altered in height and width but the shock absorber mounting point must retain the original position so as not to change the angle of the shock absorbers.

  • The swinging arm can be altered in width and length but the shock absorber mounting point must retain the original position so as not to change the angle of the shock absorber.

Front Forks

  • All machines apart from class F (two strokes to 1970) must be fitted with forks which appear externally to be of  pre-65 British manufacture. Telescopic forks must be fitted with rubber gaiters or metal shrouds.  R.E.H., M.P and Ceriani are not allowed.

  • Class F machines can be fitted with forks of original appearance or pre-70 R.E.H, MP or Ceriani forks where originally fitted.


  • Only pre-65 British manufactured or replica yokes can be used.


  • Size of wheels not to exceed 21" front and 19" rear


  • Hubs must be of pre-65 British manufacture or replica, period Rickman, R.E.H. etc allowed

Rims And Spokes

  • Any make or origin of rims and spokes can be used


  • Tubeless rims can be fitted  but must fitted with correct size inner tubes. Valve must protrude through Rim

  • Any make of tyre can be used, but tread pattern must be of standard trials type

  • Tyre cutting is not allowed

Tyre Pressure

  • Riders choice

  • Rear Shock absorbers

  • Any rear shock absorber, other than separate oil/gas reservoir type, can be used.

  • Length of rear units to be within the range of good sense and reason.

Fuel Tank And Seat Unit

  • Any type of tank and seat unit can be used.

Engine And Gearbox

  • Engine and gearbox must be original or of the same type manufactured for the appropriate class.

  • No hydraulic Clutch or Clutch Controls to be fitted.


  • Must be of British manufacture and the type originally fitted to engine.

  • ALLOWED ALTERATIONS - Amal mk I and mk 1.5 concentric allowed. (standard trim and premier versions allowed)

  • - Tiger cubs may be fitted with non-British manufactured carburettors


  • Any ignition system can be used.


  • Front and rear brakes must be fitted and working.

  • Only hub brakes may be used (no disc brakes).

  • Any linkage for rear brake may be used i.e. rod or cable.

  • Brake shoes may be fitted with any type or make of lining.

  • No hydraulic Brakes or Brake Controls to be fitted.

Exhaust And Silencers

  • Any exhaust system may be used but a reasonable air gap between exhaust pipe and fuel supply is required.

  • Silencers must  be effective. If a machine is deemed to be too loud, entry may be denied.


Particular Machine Rules

Classes A,B & C - Pre units over 347cc

  •  Frames must be originally designed for engines over 347cc

Class F - Two Stroke

  •  British two stroke machines manufactured from 1965 to 1970 are eligible to enter and compete in the F class.

  • Two strokes originally fitted with leading link forks cannot be changed to telefork suspension units of any age.

  • Greeves fitted with banana forks are accepted as pre 65.

  • Pre 70 R.E.H., Ceriani or M.P. can be used on F class machines where originally fitted.

  • Sprites fitted with B.S.A., Norton or A.M.C. forks are accepted as pre 65.

  • Four speed Bantams are allowed in two strokes Class (F).

  • Sprites, James etc may use leading link forks or telescopic forks -BSA, Norton, AMC etc.

Tiger Cubs

  • Tiger Cubs are allowed to use carburettors other than of British manufacture.

  • Tiger Cubs up to 250cc can enter and compete in the D class.

Class G - Twin cylinder

  • pre unit or unit engines can be used

  • Royal Enfield Crusader type frames can be used

Class  V, - Vintage 2 stroke (pre 1958)

  • Bantams in Vintage Two stroke class V must be three speed only and have the type of forks as fitted to D1 or Major etc up to 1956

  • Villiers powered machines can use 6e, 7e or 8e engines.


Rules for Riders

Age Limits

  • The minimum age for riders is 14.

  • Riders under 16 are limited to a machine of up to 250cc, and must be accompanied at all times during the trial by a competing responsible parent or guardian.

  • Riders under 18 must  have the parental consent section of the entry form signed by a parent.

  • There is no maximum age limit, we have riders in their 80's still competing.


  • Competition licence, We are affiliated to the A.M.C.A. and the ACU. A competition licence is not required to enter our events.

  • Driving licence - with the exception of the West Riding Trial, all our events are held on private land and therefore a driving licence is not required.


  • Non-members can ride in one trial as a guest. Any points scored as a guest will not count towards the championship.


  • Each rider can only use one machine in an event, the machine must be for the rider's sole use during the event.



  • Approved Motorcycle Safety helmets must be worn at all times whilst riding at the venue.

  • Riders are responsible for their own safety and must not enter a section if they believe it is unsafe to do so.

Yorkshire Classic Motorcycle Club Ltd

The Premier Pre-65 Trials Club

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