175 Bantam Formula

1.    CAPACITY:    All  machines will be of 190cc capacity maximum.

2.    ENGINE:         Modifications to engine or gearbox are allowed, provided that conditions (a) to (i) below are met: -
(a)   Bantam crankcases must be used, and remain externally unchanged, except for increasing stud centres to 60mm, on 52 and 55mm versions.
(b)   Stroke to remain standard (58mm)
(c)  Disc valve and Reed valve induction is prohibited.
(d)   Pressurised fuel injection is prohibited.
(e)   Only BSA close ratio and BSA normal ratios gears or exact copies (e.g. AA Snell ) to be used. Maximum number of gears: three if close ratio, and four if normal road ratios
(f)   Only standard cylinder barrel to be used, but may be modified internally.(Alloy Todd and BTW copies deemed to be standard but to remain externall unchanged )
(g)  Cylinder stud centres not to exceed 60mm
(h)   Water-cooling prohibited
(i)    Ignition to be fixed timing. (i.e. not advancing or retarding type), however Ducati Energer and PVL straight line (max 4deg retard are allowed)
(j)   Exhaust power valves prohibited.

3.    FRAME:            Must retain Bantam main loop, but may be modified.

4.    WHEELS:          Must retain wire-spoke wheels.

5.    BRAKES:          Front Brake:       No restrictions
                          Rear Brake:       Must retain Bantam hub (may be modified)

6.   FORKS:             No restrictions

7.    TANK:               Must be mounted in normal position on machine.

8.    FUEL:                Only Petrol or Avgas 100LL mixture to be used.

9.    CARBURETTOR:     Size: 38mm maximum, circular bore only.

10. ACU standing regulations for road racing machines apply (where applicable).

11. Any rider winning the Bantam Championship on a 175cc machine must progress to 125 thereafter

Version 22-08-01.