Concept: This section is for specially built machines, representing the highest form of stock based appearing motorcycles. Replica tank, seat, guards etc permitted. There is a choice of two different bike configurations:
1 - Maximum of 72” wheelbase and up to 10” wide rear tyre with wheelie bars.
2 - Maximum of 75” wheelbase and up to 7” wide rear tyre with no wheelie bars.
machines
Note: Class requirements must be read in conjunction with the General Racing Regulations 2.0 and Safety Regulations 5.0.
Class Requirement
NZDRA Competition licence required. See Credentials 3.0.
Turnaround- Must be capable of a 45 minute turnaround time. Timed from the last pairing.
Classes
AA/AB 1000cc and over supercharged
A/AB 1000cc and over naturally aspirated
BB/AB 650cc to 999cc and over supercharged
B/AB 650cc to 999cc and over naturally aspirated
CC/AB 250cc to 649cc and over supercharged
C/AB 250cc to 649cc and over naturally aspirated
Note: V-twin engined motorcycles get a 40% additional cubic capacity break. i.e Harley Davidson 1340c.c is eligible for “B” classification
Engine
Carburettor / injection – butterfly type carburettors or injection must be fitted with push pull type throttle cable actuation and two return springs
Engine – Any engine modifications permitted, engine swaps permitted provided replacement is from the same manufacturer as the original and is of the same configuration and series.
Exhaust – Any exhaust system permitted.
Fuel – Any fuel permitted with the exception of nitro methane.
Fuel Shut Off – Fuel shut off valve must be installed in fuel lines between the tank and carburettor(s). EFI engines may have an operating tip over sensor instead.
Throttle – Must have a spring loaded throttle return. Butterfly type carburettors must have two return springs fitted.
Supercharging – Any form of mechanical supercharging, turbo charging, or Nitrous Oxide permitted.
Frame
Chain guard
– Either stock chain guard, or on made from 5mm (minimum) aluminium, or 3mm
(minimum) steel must be fitted. Must
cover top run of chain and extend to vertical tangent from rear of sprocket.
Foot pegs – Foot pegs and foot controls may be lowered and / or rear set.
Steel tube frames- Engine cradle must be stock. Onus of proof on entrant. On frames using multiple tubes behind the head stem the uppermost tube may be replaced with a section of larger diameter for use as a fuel tank or breather tank.
Frame modification for clearance of ancillary components (eg fuel injection, carbs, fuel tank etc permitted material moved does not detract from the strength or street appearance of the machine and is not removed or relocated for purposes of weight redistribution. Wheel base may be increased to a maximum of 72” for bikes fitted with wheelie bars or 75” if not. Steering head may be raked to any angle taking into account the above rule for wheelbase. Frame geometry, headset or other structural modifications must be performed by a competent person. Entrant may be required to produce evidence. Any welding done on new frames or as part of major structural modifications should not be ground, and must be tech inspected prior to painting.
It is mandatory that the angle of rake ( the angle between the steering head and a vertical line through the steering head) should not be decreased from stock as this reduces trail which may cause instability.
Swing arms - may be lengthened or modified provided the basic street appearance is maintained. Fully welded “back halve” conversions are allowed for the fitment of wider rear tyres. Suspension dampener units may be replaced with bolted or welded struts and linkages may be replaced with suitable replacements for the purpose of lowering.
Aluminium Alloy frames- Duplex cradle type frames must retain stock cradle, Perimeter type frames must be stock with the exception of the rear sub frame. Onus of proof on entrant.
Minor frame modification for clearance of ancillary components (eg fuel injection, carbs, fuel tank etc permitted material moved does not detract from the strength or street appearance of the machine and is not removed or relocated for purposes of weight redistribution. Wheel base may be increased to a maximum of 72” for bikes fitted with wheelie bars or 75” if not. Steering head may be raked to any angle taking into account the above rule for wheelbase. Frame geometry, headset or other structural modifications must be performed by a competent person using TIG welding process. Entrant may be required to produce evidence. Any welding done on new frames or as part of major structural modifications should not be ground, and must be tech inspected prior to painting.
It is mandatotry that the angle of rake ( the angle between the steering head and a vertical line through the steering head) should not be decreased from stock as this reduces trail which may cause instability.
Swing arms - may be lengthened or modified provided the basic street appearance is maintained. Swing arm pivot point must be retained and swing arms must not be welded to the frame. Suspension dampener units may be replaced with bolted struts and linkages may be replaced with suitable replacements for the purpose of lowering.
Ground clearance – Minimum of 50mm with rider seated on machine.
Guards – Rear wheel guard or road racing type seat required. Exposed flywheels or pulleys must be fitted with a guard to prevent riders legs or body from coming into contact with it in any circumstances.
Handlebars – Must be mounted in stock location, clip on bars allowed only where factory original.
Steering – Steering damper highly recommended.
Bodywork – fairings not permitted unless factory original, may be reproduced in fibreglass etc but must retain original appearance. Models that have a fairing and screen fitted as standard must use them or replicas. Fairings may be trimmed for ground clearance, or to clear the exhaust. Screens must be thin and flexible for safety reasons (i.e polycarbonate). Front and rear lights must be fitted and in stock location but may be cosmetic only.
Suspension – (front and rear) Front forks may be extended a maximum of 300mm. No bolt on extensions permitted. Machines running without wheelie bars may have forks shortened but must retain 25mm of travel. External straps or devices used to limit fork extension must be recognizable as fit for purpose. No metallic tie rods to be used. Fork assembly may be exchanged for another non-rigid type assembly, which may be of sufficient size, strength and length to adequately support machine and rider for normal street riding. Minimum fork diameter of 30mm. Fork bracing is compulsory on all bikes known to be capable of exceeding 130mph. Steel or steel reinforced non metallic guards are acceptable as fork bracing.
Steering dampers are highly recommended and must be fitted if directed by stewards after experiencing high speed instability.
Wheels and Tyres – Slicks permitted. All tyres on motorcycles will be visually checked for condition, pressure, etc and must be considered safe by the scrutineer prior to any runs by the motorcycle.
|Up to 210 kph Motorcycles – Must use a minimum of H rated tyres.
210 to 260 kph Motorcycles – Must use a minimum of V rated tyres.
Over 260 kph Motorcycles – Must use a minimum of Z rated tyres. Motorcycle racing tyres clearly marked “for racing purpose only” will be accepted.
Wheelie Bars – Permitted provided wheelbase does not exceed 72”. May be adjustable, but must be fixed during the run. Any movement or adjustment during run prohibited. Wheelie bars wheels must spin freely on start line. Preloading prohibited, no metallic wheels allowed.
Wheels – Must be automotive type wheels suitable for use, all spoke holes in rim and hub must be properly cross laced to provide maximum strength.
Rider Safety /
Support
Brakes – Must be fitted with operative brakes front and rear
Helmet – Mandatory.. Must have visor or shatter proof goggles. See Safety Regulations 5.57.
Protective Clothing – All riders of bikes capable of less than 120 mph – Minimum of leather motorcycle jacket and leather pants. Heavy trousers are acceptable in lieu of leather pants.
All riders of bikes capable of exceeding 120 mph – Mandatory purpose made motorcycle leathers, leather gloves and boots of at least 200mm leg height.
Back Protector mandatory for bikes capable of exceeding 150 mph.
Tow Vehicles – Permitted. See general racing regulation 2.22 & 2.26
| Back | Forum | Top of Page |