• MSA Registered
• ABKC Member
• Racing since 1959

Prokart Extreme Rules and Regulations



1.0 Title & Jurisdiction
The championship shall be referred to as the RPM Prokart & Cadet Honda Extreme Championship and is
held by Lincolnshire Kart Racing Club (referred to within as LKRC) and in accordance with these
Championship Regulations, Race Day Regulations and Technical Regulations.

1.1 Officials
LKRC Club Secretary: Lynne Healy
LKRC Competition/Membership Secretary: Julie Thornsby
Series Coordinator: David Sullivan
Eligibility Scrutineer: Roger Pitchford of RPM Racing Engines & Mr Gary Walker
Championship Stewards: LKRC

1.2 Competitor Eligibility
Open to any competitor who meets the class technical regulations eligibility. There are no specific license
requirements although a competitor must satisfy the Clerk of the Course of his/her competence to race.

1.3 Registration
Registration is deemed by the organisers to be acceptance of and agreement to all of the regulations.
The organisers reserve the right to refuse or suspend registration of a driver to protect the best interests of
competitors and organisers.

Entry shall be made on line via https://fss.alphatiming.co.uk/register/ikr before midday on the Saturday
proceeding the race day.

Entry fees will be as follows:

Championship Registration £10.00
Saturday Practice £35.00
Sunday Race Day £40.00
Transponder Hire £10.00

1.4 Championship Points
Points for both championships will be awarded as follows:

Pole Position:

P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P16 P17
35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
P18 P19 P20 P21 P22 P23 P24 P25 P26 P27 P28 P29 P30 P31 P32 P33 P34
18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2

Final Result:

P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P16 P17
70 68 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52
P18 P19 P20 P21 P22 P23 P24 P25 P26 P27 P28 P29 P30 P31 P32 P33 P34
51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35

Drivers not taking the start lights or completing the final will receive their grid points plus 20 points.

1.5 Championship Format
The championship will consist 7 rounds, each round will consist of 3 heats & 1 final.
The final points standings be decided based on a drivers top 6 scores (1 dropped round), should a driver be
excluded from an event, this (or these) scores must form the Championship score and cannot be dropped or

1.6 Championship Race Numbers
Numbers must be displayed on the front, side and rear of the kart in a legible font in the correct class
All rookies must use white numbers on a black background regardless of class.
All drivers must pick a unique number which they will hold for the entire season.

The class colours are as follows:
200 Cadet Extreme – red number on a yellow background
200 Senior Extreme – black number on a yellow background

Numbers 1 to 10 are reserved exclusively for those drivers finishing in the respective position from the
previous year’s championship.
Number 0 is reserved for the winner of the championship 0 Plate meeting should such a meeting be held.

1.7 Clerk of the Course
Whilst the organisers of the series will endeavour to use the same officials at each of the rounds this may
not always be possible so is therefore subject to change.
The Clerk of the Course appointed for the championship and each event will have total jurisdiction. The
Clerk of the Course’s decision is final and binding on every driver. The Clerk of the Course reserves the
right to alter or change any regulation with little or no notice, for instance in force major circumstances or
with a majority decision of drivers.

1.8 Penalties
Penalties for various offences are as set out by LKRC and are available on their website
It is at the discretion of the Clerk of the Course to administer a different penalty to the one listed if they deem
fit. For offences not covered in the list of penalties the Clerk of the Course has the sole discretion and
penalties may vary from a verbal warning to a driver; to exclusion of from the championship.


2.0 Event organisation
The RPM Prokart & Cadet Honda Extreme Championship is a non-MSA series run by LKRC & is held under
the provisions of these regulations. These may be changed, varied or amended to suit at the discretion of
the CoC and/or the organisers with consultation with the competitors. If a change is made adequate notice
will be given so that Drivers/Mechanics can make changes to comply with the new rules and regulations.
Changes will be published on the LKRC website (Fulbeck Event Page). Matters of safety will take immediate

2.1 Karts
Only karts complying with the Technical Regulations are eligible.

2.2 Signing on
Upon arrival drivers must report to Reception, comply with the Race Organiser’s established procedure for
‘Signing on’ and complete such paperwork as is required by the Race Organisers.
Signing on must be completed at least 15 minutes before the drivers briefing starts.

2.3 Competitors Eligibility
All competitors must be registered to the series. Registration is £10.00 per year.
All drivers must have signed on to race either at Saturday practice or before drivers briefing Sunday.
Drivers under 18 years must have their entry countersigned by a parent or guardian who must be present
for the complete meeting.

2.4 Entries
Entries must be made prior to the event, with the correct race number and transponder number. Please also
state at this point if you will require to hire a transponder.
A maximum number of 34 karts are permitted to enter each race. Further entries may be accepted at the
discretion of the organiser & may result in a change of format, otherwise entries will either go onto a reserve
Entries will be taken on a first come first serve basis. Only receipt of full payment constitutes a race entry.

2.5 Apparel/Clothing
When testing or racing a driver must wear as a minimum a helmet (BS6658 type B minimum) which fits
correctly with a functional strap, an abrasion resistant overall or race suit. gloves and footwear that provide
foot protection.
All clothing must be in good condition, free from holes, tears, etc., and to the satisfaction of the Clerk of
Waterproof over-suits may be used provided they are over an approved race suit.
Competitors are required to keep their helmets on, fastened and their other protective clothing in place until
they are clear of the boundaries of the racing circuit.
Competitors must not carry bum bags, tools, weighted belts, or the like.

2.6 Scrutineering
Drivers must present themselves, together with their protective clothing and their kart to scrutineering. The
kart must be carrying the maximum ballast with which it will race, securely attached.

2.7 Briefing
Drivers and Guardians must attend the drivers briefing. Any driver not present at the drivers briefing will not
be permitted to race.
Any driver who is found to be in the kart on track that has not attended the briefing will be excluded from the

2.8 Testing / Practice
LKRC offer open practice the day before a race meeting which will be run in sessions. There will also be a
5-minute practice on race day.

2.9 Driving standards
If a driver leaves the circuit they must re-join when it is safe to do so. Failure to comply will result in a
penalty at the discretion of the CoC.
Missing either chicane will result in a 10 second penalty, missing the chicanes twice in a heat/final will result
in a one lap penalty. Any driver missing the chicane must wait until it is safe to re-join and must not gain an
advantage. Anyone re-joining in an unsafe manor will be black flagged and excluded from that race. Anyone
persistently missing the chicane on test days will not be allowed out in the following session. You may miss
the chicane should an incident occur where the track is blocked, for any other reason the above penalty
Passing under a stationary yellow flag will result in a 10 second penalty, if you allow the driver to regain
position this penalty will not apply. Passing under a waved yellow WILL RESULT IN A 20 SECOND
Any kart causing a red flag incident may only take part in the restart after being inspected by the scrutineer
and at the discretion of the clerk.
All karts involved in a serious incident must be re-inspected by the scrutineers before allowed back on

2.10 Grid positions
Grid positions are allocated on a randomised basis. The grid for the first heat will be determined by receipt
of entry. Grid positions for the remain 2 heats will be allocated to ensure each driver has a front / middle /
back starting position.
Grid positions for the meeting final will be determined based on the driver’s performance in the 3 heats, with
the driver having the lowest cumulative finishing positions starting from pole position with the rest of the field
in corresponding order. To resolve a tie in the grid position for the final the driver with the highest points in
the 1st heat will take the higher position.

2.11 Driving karts when not on the circuit
Karts must not be driven in the paddock area & must be taken to & from the dummy grid on a trolley.

2.12 Dummy grid
You must be in your grid position by the last lap of the race on circuit otherwise you will be put to the back of
the grid.
One driver, one mechanic only allowed on the grid.

2.13 Race format
A meeting shall consist of 3 heats & a final where permissible.
Heats: 10 minutes + 1 lap
Final: 12 minutes + 1 lap

2.14 Race start procedure (Seniors)
Seniors will have a rolling start.
When signalled to do so, drivers will be released from the dummy grid & will have 1 rolling lap.
Starts are to be 2x2 formations. Drivers are permitted to regain their place on the rolling lap up to the yellow
flag at post 5. The CoC has the option to change to standing starts if deemed necessary.
Once round to the pit lane speed is to be reduced to a “fast jog”.
If the starter is satisfied with the relative positions and the speed the CoC will signal the start of the race.
The race start will be as C.I.K (as lights go out the race starts).
If the pace is too quick or drivers are not in formation, karts will complete another lap in formation and
approach the start-line again.
If the correct pace/speed is not obtained by 2 rolling laps the offending drivers will be put to the back of the
On the first lap only the first chicane shall be omitted.

2.15 Race start procedure (Cadets)
Cadet starts will have a standing start.
When signalled to do so, drivers will be released from the dummy grid on to their grid slots. There shall be
no rolling lap although one may be added at the discretion of the CoC.
Once all the karts are in position the lights will go red and then go out indicate the start of the race.
On the first lap only the first chicane shall be omitted.

2.16 Race end
At the end of the race, which shall be when the race leader next crosses the start/finish line after the
prescribed duration, the chequered flag shall be shown at the start/finish line. When a race has finished a
yellow flag will be shown at the next post. Racing must stop when you have taken the chequered flag.
Drivers must slow to a steady pace. DO NOT overtake on the return to parc ferme. Drivers not obeying this
rule and who continue to drive at excess speed will be disqualified from that race and further action may be
taken by the clerk.

2.17 Weighing
The minimum weight limit for each class is set out in the Technical Regulations item 3.13
Scales will be available for use prior to race commencement. Drivers must stop before the scales and push
their kart on.
The weighbridge official will record the weights of every driver that enters the scales.
Once the weighbridge marshal is happy that you are above the minimum weight you will be notified.
If found underweight, the weighbridge official will contact race control to exclude the driver.
Only the driver can request an immediate re-weigh and will be allowed to pull their kart back off the
weighbridge and then drive back on to the weighbridge.
No person or persons, other than the driver may enter the weighing/scrutineering area, until instructed to do
so by a scrutineer. Failure to comply could result in action being taken against their driver.

2.18 Timing and lap scoring
Timing is by AMB transponder. There are a limited amount to hire at £10.00. A drivers licence or valid bank
card is required as deposit. If you do not have a transponder fitted you will be able to compete but will not be
scored. If you break, lose or misplace a transponder you will be required to pay for a new one. All
transponders MUST be mounted on the back of the seat.

2.19 Flag signals
Drivers must without delay obey all flags given by officials. Drivers are responsible for learning all flags and
their meanings before going out on circuit. If you are in doubt please ask before racing.

2.20 Mechanical Failures
All drivers must obey mechanical flags given within 2 laps. The driver and one mechanic can carry out the
repair and return to the race at the discretion of the scrutineer. Failure to return to parc ferme will result in an
exclusion from that race.

2.21 Awards
Trophies will be provided by the Race Organisers for First, Second and Third places.


3.0 Scrutineering
Competitors should work on the basis that if any process is not clearly stated as being permissible, then
they should accept that it is illegal.
Karts must comply with the following technical regulations at all times during official practice and racing. It is
the competitors’ responsibility to ensure that their kart complies.
Technical checks may be carried out before, during after practice and racing. The scrutineers are
empowered to undertake any form of verification they deem necessary.
The scrutineer may select one or more karts at any reasonable and appropriate time from which the
engine(s) shall be removed. They also reserve the right to take away an engine or engines for inspection
and dynamometer testing if they wish. Engines may be returned to the competitors without reassembly.
If an infringement has been found to exist, the driver is liable for an inspection fee in addition to any
The supplier or race organiser reserve the right to substitute a competitor’s engine(s) with a spare sealed
engine at the request of the scrutineer.
All drivers must attend scrutineering with their protective clothing/ appropriate racewear.
The kart will have the maximum amount of ballast with which it will race, securely attached.

3.1 Scrutineering Cards

LKRC reserves the right to issue competitors with a scrutineering card, which they have SOLE responsibility
to fill in correctly and hand to the scrutineer at pre-race scrutineering.
This card must contain the following information: Drivers name, class and race number. The chassis make &
number. Each engine's unique number with the RPM engine seal numbers written alongside & the tyre
barcode numbers (Cadets)
The card must be signed by the driver and in the case of drivers under 18 also their entrant.
These cards will be the only method used to check that each competitor is using at all times the equipment
declared and presented by him/her at pre-race scrutineering.
At any post-race scrutineering the chassis, engine numbers, seal numbers & tyre barcodes must be those
stated on the scrutineering card.
Should it be found that the chassis, engines or seals do not comply with the above requirements, or that the
tyre markings or bar codes, are missing or incorrect, it will be considered to be a matter of fact for which
there will be no appeal.
It is the responsibility of the competitor to ensure that a seal or mark is not missing or damaged.

3.2 Engines
The sole supplier of engines to the championship shall be RPM Racing Engines Ltd
(1 Lakes Court, Lancaster Park, Newborough Road, Needwood, Burton on Trent. DE13 9PD) 01283575566
Roger: 07977 430680 roger@rpmpower.co.uk Wilks: 07377800888 wilks@rpmpower.co.uk

GX200 RPM Extreme engines must be sealed at all times, if any of the 4 seals are damaged, tampered with
or missing this will render the engine illegal. Engines will be verified where required, by the supplier, and
only the supplier or scrutineer can remove seals for inspection purposes.
During the course of a meeting a competitor may replace their engine(s) with the authorisation of the
scrutineer, at which time their scrutineering card will be updated accordingly with the details of the
replacement unit(s). The original engine(s) must be left with scrutineer.
In the event of an engine change, it is highly likely that both the original(s) & replacement engine(s) will be
taken away for inspection and dynamometer testing.

3.3 Chassis
200 Senior Extreme Wheelbase: 1060mm ± 20mm
200 Cadet Extreme Wheelbase: 900mm ± 5mm

Karts must be from a recognised Manufacturer by definition and specification. The kart must satisfy the
scrutineer that it is safe, is of construction strong enough, and has brakes, wheels and steering adequate for
speeds likely to be attained. It should not include any components of a temporary character, not present any
undue hazard to its driver or other competitors. The chassis must be of one-piece construction, either
blazed or welded.
It must be constructed from magnetic steel tubing whose cross section is free. No form of chassis frame
control such as pivots, dampers or similar devices is permitted. With the exception of those requires for seat
fixing, no additional holes may be drilled in the rolling chassis, whether for lightening or any other purpose.
During the course of a meeting a competitor may only use one chassis, although the components fitted to
that chassis, may be replaced.
At the discretion of the scrutineer, a chassis may be replaced in the event that the kart is beyond reasonable
repair. Please note that competitors will only be permitted to use another chassis once the scrutineer has
inspected the damaged kart and confirmed that the replacement chassis is in fact a ‘bare’ chassis. Report
all changes, failure to do so may result in exclusion.

3.4 Axle
200 Senior Extreme – A solid or hollow magnetic parallel bar of 30mm diameter.
200 Cadet Extreme – A solid, magnetic parallel bar of 25mm diameter.
For both classes, no differential of any type is permitted.

Unless two securing bolts are fitted to the hubs on the rear axle, Any hub with an overall length, excluding
wheel studs, of less than 60mm must not overhang the rear axle.
One hydraulic or mechanical brake should be fitted to the rear axle only. The brake disc must be made of
metal but can be vented and drilled/ slotted. A caliper with a maximum of four pistons may be used.
Additional air ducting to the rear brake is permitted but must be securely attached.
Drive is to be by 219 chain. All chains must be adequately protected at all times.
200 Senior Extremes are to have a minimum of a chain guard strip.
200 Cadet Extremes should be fitted with a fully enclosed chain guard. (tillett type or similar)
The top of the clutch, the chain itself, and axle sprocket and gear must be covered. Sprocket protectors may
be used.

3.5 Brakes
200 Senior Extreme - A single hydraulic disc brake fitted to the rear axle must constitute the only braking
system. The disc must be of metal, but can be vented, drilled or slotted. Only a calliper with a maximum of 4
pistons, 2 per side of the disc, may be used. A brake safety wire should be in place in case of linkage
200 Cadet Extreme - Homologated Cadet brake system. Mechanical or hydraulic operation, solid disc,
operating on the rear axle only. Interruptions on the friction surface (drilling, slots etc.) are permitted on
homologated systems only and must be specified on the homologation form. Radially vented discs are not
permitted. The brake linkage must be duplicated.

3.6 Gearing
Gearing is open for both classes. The organisers reserve the right to move to a fixed gearing at one
meetings notice.

3.7 Bodywork & bumpers
All karts must be fitted with bumpers and bodywork providing front, rear and side protection.
The use of the bigfoot style Nassau panel is prohibited.
All karts must be fitted with a rear bumper which can be manufactured in steel tube or CIK Plastic
construction. The horizontal rails of the bumper must be wider than the outer chassis rails but the bumper
must not extend outside the rear wheel/tyre measurement. The bumper must cover at least 50% of both rear
wheels/tyres at all times. The bumper must be attached to the chassis in two positions and in a manner to
withstand considerable impact.
Numbers must be displayed on the front, side and rear of the kart and be clearly visible to the officials at all
times. Numbers and backgrounds will not be supplied by the organisers.

3.8 Steering
All karts must have the steering column mounted in such a way that, even if the bottom retaining bolt is
removed, it cannot pull free from the lower bearing.

3.9 Seat
The type and construction of the seat is free so long as it is mounted in the originally intended position, of
sound and ridged construction and securely mounted.

3.10 Throttle Linkage
Separate return springs must be fitted to each carburettor and to the throttle pedal, each acting
independently. A linkage may be manufactured to actuate the standard Honda throttle. This may include
fitting additional return springs.

3.11 Fuel
Only standard forecourt grade unleaded fuel permitted. NO fuel additives of any type permitted.
A standard floor mounted fuel tank should then be used, unmodified and this tank and its mounting must be
in accordance with the chassis manufacturer’s instructions.
Fuel pipes must be no more than 5.3mm i.d. and must take a direct route to the carburettor and be safely
One in-line fuel filter of nominal capacity per engine may be fitted.

3.12 Wheels
Wheels may be of two piece or mono aluminium construction, i.e. spun aluminium, diecast aluminium or
sandcast aluminium.
Hubs may be separate or integral, any hub with an overall length (excluding wheel studs) of less than 60mm
must not overhang the ends of the rear axle, measurement to be taken from the wheel-to-hub mating
A circlip must be fitted on each axle end to prevent accidental loss of the hub.

3.13 Tyres
Control tyres for dry and wet conditions are as follows:

200 Senior Extreme
Dry & Wet: Bridgestone YDS Front 4.5 x 10 x 5, Rear 7.1 x 11 x 5

200 Cadet Extreme
Dry: Dunlop LS2-MSA - Front 10 x 3.6 x 5, Rear 11 x 5 x 5. Barcoded.
Wet: Dunlop KT3 - Front 10 x 3.6 x 5, Rear 11 x 4.5 x 5. Barcoded.

All wet tyres must have a minimum of 2mm tread at the start of qualifying, heats or finals.

Competitors are permitted to use 1 set of slick tyres per round, plus one extra front and one extra rear of
each type, these extra tyres may only be allowed at the discretion of the scrutineer if in their opinion either
one front or one rear tyre is damaged and un-safe to use.
IT IS THE COMPETITOR'S RESPONSIBILITY to make sure that the scrutineer inspects a faulty tyre before
the kart leaves the track exit/weighing in area at which time their scrutineering card will be updated
accordingly. No extra tyre will be allowed after the kart has returned to the parc-ferme area.
The use of any equipment or chemical designed to preheat the tyres or retain heat in them, soften or
otherwise modify tyres or their compound prior to use is strictly prohibited.
A set of parc ferme control tyres maybe issued at random or at the Clerks decision.

3.14 Weight
Minimum weight of kart and driver must not be less than the class minimum weight at any time. This can be
checked at any point within the race day.

The minimum weight for each class are:
200 Senior Extreme – 185kg
200 Cadet Extreme – 105kg

Ballast may be added to the kart to achieve the required weight & must be securely attached to the
scrutineer’s satisfaction.