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Machine Regulations 2017 season.


Issued 4/12 /2015

By the elected technical committee:-

  Zac Grief

  Steve Lawton

  John Whiting


General Requirements:

ALL machines must comply with ACU Standing Regulations.

This is Classic orientated road racing for machines of the style and type used up to the cut off  date of 1983 when the 50cc GP ceased to be a class.

The Technical Committee will respond to any query within one week, and the question and outcome will be posted on the club forum.

It is the rider's responsibility to make sure that his machine is presented in a clean, tidy and safe condition at each meeting with particular attention to safety critical components such as brakes, for example when engines have been upgraded in existing chassis.

It is on the onus of the rider to check with the Committee that the machine meets the criteria set out below.


Frame:

Steel tube, Aluminum Monocoque or plate types are allowed, No modern or twin-spar types allowed.

NO upside down forks are allowed.


Brakes:

Twin pot/piston Disc Brakes are permitted but must be of period appearance, no modern wavy discs allowed. Maximum diameter of  disc is 240mm.


Wheels:

17" minimum in diameter with WM1 or 1.6 maximum rim widths.


Tyres:

Maximum width 85mm when fitted. Tyre warmers, slicks, and cut slicks are not permitted.

Treaded tyres including wets can be used.

 

Engines:

Air and Water-cooled, manual gearbox with a minimum of 3 gears and a maximum of six.

50cc,  with a maximum tolerance of 5%. This also applies to 4-stroke machines.

Carburetor can be any type but electronic power jets are not allowed.

Ignition can be any type but modern looking components should be hidden.

Due to some older machines needing re-bores, or a mixture of parts to keep them in running order, a greater tolerance may be allowed, but this must be agreed by the Committee prior to racing.

 

Race Numbers:

Black numbers on white backgrounds.

 

Bodywork:

Any bodywork representative of the classic pre 1983 style period can be used.

Any carbon fibre must be painted in a solid colour.

Rain Lights Must be fitted and functional.

 

Racing Classes

Classic Open with a separate Air Cooled class.

 

Guest Riders/ Machines:

A machine or rider deemed of special interest that does not fully meet the above criteria may be permitted to ride with the club at the discretion of the Committee, this rider will not be able to gain Championship points and will be restricted to 3 meetings per season.

 

Technical queries:

If any clarification is required on engine, chassis, etc, contact one of the Committee to ensure that you are building an eligible machine. Machines that do not follow these rules will not have points counted towards Club Championship awards and may not be permitted to start a race. If you have any eligibility issues about a machine then express them at the time not when it's too late to change results or points.

Technical Committee:

Contact details:-

Steve Lawton  07788 905806  ( mobile )

John Whiting    07762 340284  ( mobile )

                   Ian Cowley       01443 831 900 ( landline ) Evenings only.

                   Ian Cowles       exactracebike@gmail.com

Please also see the contacts page of the this website for additional contact details.


Machine Regulations Links to useful articles

Carburettor jetting


http://forums.pstuning.com/index.php?showtopic=545

Reading Piston Wash


http://forums.pstuning.com/index.php?showtopic=1559

On this page you will find the complete technical eligibility specifications for bikes able to compete in our club championships as set by our current Technical Committee for the season in 2017.


PLEASE PAY ATTENTION TO THIS IMPORTANT NOTE:-

To avoid expensive and frustrating mistakes, please take special note of the advice at the bottom of the regulations to check with the technical committee BEFORE you commence building any new machine, in order that any machine you intend to build, WILL use components that are compatible with our regulations and that the finished machine WILL comply with the overall aesthetic appearance of 50cc racing classic machinery that the club requires.


A printable version of the following regulations is available via the downloads page of this website.