Post by media50 on Jan 8, 2021 13:40:06 GMT
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 80mm 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.
Swept volume of 50cc, with a maximum over volume tolerance of 5% for UNPLATED BORES ONLY (i.e. 52.5cc ). Plated bores of any type CANNOT use the 5% oversize tolerance ( ie. 50cc max )
This also applies to 4-stroke machines.
Machines with an engine capacity over this tolerance may be allowed to race but this must be agreed with the event organizers and race director prior to commencing the race. Riders using this rule must register with the club technical committee and organizers prior to the event.
Should any machine outside the 5% tolerance be entered in a 50cc race this must be registered with the clubs technical committee in writing and will not score any club championship points. THIS IS CRUCIALLY IMPORTANT due to insurance implications.
Carburetor can be any type but electronic power jets are not allowed.
Ignition can be any type but modern looking components should be hidden.
As in previous season modern engines and a mix of parts will be allowed
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
Water cooled and Air Cooled classes.
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
Baz Waumsley 07429 161091
Please also see the contacts page of the this website for additional contact details.
Note:- The above are "Classic and Modern 50 racing club" specific rules.
For rules and queries relating to the ACU National 50cc Championship please contact the ACU directly and address any queries to their technical section, and /or contact Brett Moor via a private message on the ACU 50cc Championship Facebook page. ( Link on this website’s front page ).
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.
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 80mm 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.
Swept volume of 50cc, with a maximum over volume tolerance of 5% for UNPLATED BORES ONLY (i.e. 52.5cc ). Plated bores of any type CANNOT use the 5% oversize tolerance ( ie. 50cc max )
This also applies to 4-stroke machines.
Machines with an engine capacity over this tolerance may be allowed to race but this must be agreed with the event organizers and race director prior to commencing the race. Riders using this rule must register with the club technical committee and organizers prior to the event.
Should any machine outside the 5% tolerance be entered in a 50cc race this must be registered with the clubs technical committee in writing and will not score any club championship points. THIS IS CRUCIALLY IMPORTANT due to insurance implications.
Carburetor can be any type but electronic power jets are not allowed.
Ignition can be any type but modern looking components should be hidden.
As in previous season modern engines and a mix of parts will be allowed
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
Water cooled and Air Cooled classes.
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
Baz Waumsley 07429 161091
Please also see the contacts page of the this website for additional contact details.
Note:- The above are "Classic and Modern 50 racing club" specific rules.
For rules and queries relating to the ACU National 50cc Championship please contact the ACU directly and address any queries to their technical section, and /or contact Brett Moor via a private message on the ACU 50cc Championship Facebook page. ( Link on this website’s front page ).
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.