Regs
F300-UK
F300-UK Regulations
As a general guide, if you comply with both F300-UK and MSUKYB Regulations you are likely to meet any circuit specific requirements.
1, Licences and medicals
Being an Independent Kart Racing (IKR) club, there is no requirement for an ARKS Test, Motorsport UK licence or medical certificate. Drivers must however ensure that they are competent to drive their chosen kart and fully understand all flag and light signals listed in MSUKYB Reg Q15 and U6, along with all other standard operating and safety procedures used in kart racing. Drivers must also ensure they are fit and healthy to participate. Any driver who knows of a reason why they may not be deemed medically fit to participate must seek relevant professional advice before participating.
2, Weight
All weight categories compete in the same race, for the same points and trophies. The aim of this regulation is to reduce the disadvantage suffered by heavier drivers and allow drivers of different weights, but similar abilities, to lap safely together at a similar pace. Competitors should ideally stay in the category that they naturally fall into, however if they are able to add ballast safely as per MSUKYB Reg U17.29 they may move to the next weight category up (it is not permissible to ballast up any further). Ballast may not be attached to bodywork as per MSUKYB Reg U17.1.4. A competitor may change categories if their weight changes during the season. If it should be found that any weight category is unfairly advantaged, or disadvantaged, then this rule may be changed at any point during the season with effect from the next championship round.
Detailed below are the weight categories available and the corresponding engine specs. An F300-UK sticker must be displayed clearly on the nassau panel denoting the weight category entered.
Minimum weights are for the driver (complete with clothing & safety equipment), kart, fuel and any personal ballast carried. Weights will be measured in Parc Ferme at the end of the race using the scales provided by the host circuit. It is the competitor’s responsibility to ensure they meet the minimum weight on the scales provided.
There is no leniency in the minimum weights. Failure to meet the minimum weight will result in the driver being excluded from that race. Championship points and trophies, where applicable, will be awarded based on the amended result.
Minimum 172kg:
1. Aixro or Saetta with 12mm inlet restrictor.
2. Biland with maximum 250cc capacity.
3. Swissauto with maximum capacity of 250cc. EFI version must remain in factory spec except for the inlet which may be sleeved.
Minimum 190kg:
1. Aixro or Saetta with 14mm inlet restrictor.
2. Biland with a maximum 280cc capacity.
3. Swissauto with a maximum capacity of 280cc
4. V-twin engined karts (please reg F300.21.1)
For both weight categories carburation and exhaust is free except for the Swissauto EFI engine in 172kg class.
The use of fuel injection in either class is permitted.
3, Rotary Restrictors
The top 3 rotary engines at the end of the final of each race meeting will be expected to present their secondary port restrictors for a compliance check.
This will be done by attempting to pass either a 12.25mm or 14.25mm (depending on weight class) drill bit through the restrictor. If it successfully passes through then the competitor will be excluded from the meeting and will sacrifice all points.
We as organisers also reserve the right to randomly check any other competitors' restrictor for compliance. Failure or refusal to do so will also result in exclusion from the meeting for non compliance.
4, Brakes
In all weight categories, a hydraulic disc brake must operate on the rear axle only as per MSUKYB Reg U16.10. Front brakes may remain fitted to the kart but must not be operational and their presence must in no way interfere with the operation of the rear brake.
5, Number Plate
Any competitor wishing to warn others that they are a novice driver should have black number plates with white numbers.
All other karts must have red number plates with yellow numbers.
The following numbers are reserved and are re-allocated each season, although qualifying competitors may choose not to use them:
0 – ‘O’ Plate (if event held)
1, 2 & 3 – Previous season’s 1 st , 2 nd & 3 rd championship positions
Race numbers must be unique on the grid. Competitors will be given priority to keep their previous season’s number before any new competitors are issued a number.
6, Bodywork
Bodywork must be fitted in compliance with the dimensions specified in MSUKYB Section U, Appendix 1 , Drawing 6.
7, Transponder
A transponder must be fitted to the seat back. It should be no further than 30cm from, and have an unobscured view of the track surface. Compatible transponders are MyLaps X2, AMB Tranx 160 and MyLaps TR2.
8, Tyres
All competitors must use the Vega Green XH4 .
All drivers may use a maximum of 3 sets for the championship season.
Drivers will be allowed to use a new set of tyres for the non championship 0 plate round if they choose to.
This tyre must be purchased from Andy Cox Racing only and must have barcodes present so they can be recorded. These will be recorded at the beginning of every event. Any driver found to be racing with a non-compliant tyre will be excluded from that session.
Slick tyre condition will be continuously monitored throughout the season and the organisers may elect to allow the purchase of an extra set should degradation be higher than expected.
This would be confirmed in writing via a regulatory update.
Usage restrictions apply to race sessions only. Competitors may use any tyres of their choice during practice sessions.
Drivers must use the Vega W6 wet tyre.
There is no limit to the amount of sets of wets that can be used in a meeting or a season.
The heating or chemical treatment of tyres is prohibited as per MSUKYB Reg U16.9.6 The hosting circuit may deem any part of an event to be ‘dry’, ‘open’ or ‘wet’ as per MSUKYB Reg U12.3, however it is always the competitor’s responsibility to decide whether it is safe to continue to race in bad or unusual conditions.
9, Fuel
Fuel must be pump fuel as per MSUKYB Reg U16.17, however there is no requirement for a minimum fuel quantity to allow for fuel sampling as per MSUKYB Reg U16.18.
10, Engine
Engines must be four stroke or rotary with a maximum capacity of 300cc, with the exception of karts using an industrial based V-Twin engine (please see F300.21.1).
Contrary to MSUKYB Reg U18.5.3, the starter battery may also be fitted on the same side of the chassis as the engine.
Aixro/Saetta inlet restrictor:
Aixro/Saetta engines must be fitted with either a 12mm or 14mm inlet restrictor depending on weight category. The inlet restrictor of the relevant size for the weight category must be provided by the competitor. Restrictors will be checked as per regulation F300.14 . A competitor may register more than one size of inlet restrictor but must remain in the same weight category for the duration of any individual championship round.
14mm restrictors can be made by drilling out a 12mm restrictor but care must be taken to ensure the hole is accurately sized and drilled clean and straight.
Aixro exhaust:
Aixro engines must be fitted with a secondary exhaust silencer. This can either be the factory auxiliary silencer Part number: 2290890. Or another secondary silencer providing it meets safety and noise standards.
10.1, V-Twin Engines
Only industrial based engines can be used to race. Examples are as follows:- Honda, Kohler, Briggs and Stratton, Lifan, Loncin.
The following Billet parts are allowed to be fitted: Conrods, Flywheels, Rocker Covers and Camshafts.
Engine blocks, side covers and cylinder heads must remain made of standard manufacturers materials.
Engines must remain naturally aspirated. The use of turbochargers and superchargers is strictly prohibited.
All engines may rev no higher than 7500rpm. A breach of this will result in exclusion from that session.
11, Transmission
The rear axle must be direct drive from the engine.
A fully enclosed chain guard must be fitted as per MSUKYB Reg U18.8.5.
Contrary to MSUKYB Reg U18.8.8, karts may use larger than 219 pitch chains.
12, Sound Level
Please understand that sound limits are a major concern for all race circuits and an individual’s failure to comply could jeopardise F300’s welcome at that circuit, and others in the future. Individual rounds may be subject to a lower sound level, specified by the circuit, requiring the fitment of additional silencing. Any such round will be clearly marked in Reg F300.11. It is the competitor’s responsibility to ensure they have adequate silencing to comply prior to starting their engine at the circuit.
At all other rounds, sound levels will be monitored using F300’s own decibel meter, with the microphone set at a height of 1.5m ±0.1m. Any kart exceeding 102 dBA, but remaining below the sound limit defined in MSUKYB Reg 16.16.10, will be advised of their excess noise violation and asked to ensure they reduce below 102 dBA before being allowed to participate in any future F300 round. If a competitor finds they are unable to comply with the F300 limit, they will be given a prorate refund of any membership fee paid. Any kart found by the circuit to be exceeding the sound limit defined in MSUKYB Reg 16.16.10 will be excluded immediately from that event. Contrary to MSUKYB Reg U16.16.4, intake silencers are not required.