Official Pro-Stock Malaysia Rules

01 USABLE MACHINE TYPES

1.1 All machines must be four-wheel drive (4WD).
1.2 All types of bodies/cowl (plastic/polycarbonate) are permitted, provided that their original shape follows the original Tamiya kit design.
1.3 Bodies must have stickers or be painted for racer identification.
1.4 Bodies must be fixed securely at the front and rear using Tamiya body catches. Moving bodies are prohibited.
1.5 Added: 3-point attachment MUST be fully secured to the chassis.
1.6 All machines must go through machine inspection. Machines that do not pass inspection cannot participate in the race.

02 MOTOR (MALAYSIA AMENDMENT)

2.1 Only the following motors are PERMITTED for Malaysia Pro Stock Class (Tuned Series only):
2.1.1 Rev-Tuned / Rev-Tuned Pro
2.1.2 Atomic-Tuned / Atomic-Tuned Pro
2.1.3 Torque-Tuned / Torque-Tuned Pro
2.2 Motor Prohibitions: Hyper-Dash, Mach-Dash, Sprint-Dash, Power-Dash, and Ultra-Dash motors are STRICTLY BANNED.
2.3 Disassembling the motor to change the number of coils or performing other illegal modifications is PROHIBITED.
2.4 If there are indications that the motor cap has been detached, it will be judged as illegally modified.
2.5 Organizer's Discretion: The organizer of each race event reserves the right to permit additional motor types (e.g., Light-Dash) for that specific tournament. Any such allowance will be announced prior to the event and does NOT permanently amend these standing rules.

03 CHASSIS & BODY

3.1 Chassis must be original with NO trimming. Chassis, Cowl (body), and Tires/Wheels CANNOT BE MODIFIED in any way whatsoever.
3.2 Prohibitions: Drilling, cutting edges, sanding, filing, or reinforcing the chassis is STRICTLY PROHIBITED.
3.3 Polycarbonate Cowl (Polycowl) IS PERMITTED on the condition that its shape follows the original appearance of the Tamiya kit (the original silhouette cannot be altered).
3.4 Cowl trimming is ONLY permitted to allow movement of the damper and placement of plates. Trimming to fit other chassis that affects the original appearance of the cowl is NOT permitted.
3.5 There is no restriction on painting (spraying) the cowl, as long as it does not alter the original structural shape.
3.6 Bodies may not be split into separate pieces (except for animal-type bodies following the original manual).
3.7 Installation of foreign objects to add weight is PROHIBITED.
3.8 Attaching an aero hi-mount at the front is NOT permitted.

04 PLATES (FRP/HG)

4.1 Only 3 (THREE) pieces of 1.5mm FRP/HG plates are permitted to be installed on the entire machine.
4.2 Counting Rule: The left side and right side at the same position (e.g., left side plate and right side plate) are counted as 1 (ONE) piece of FRP.
4.3 Additional Rules:
4.3.1 IMI plates are permitted subject to the organizer's discretion, as long as they follow the original size and shape issued by Tamiya.
4.3.2 For example, some Tamiya plates are only available in 1.5mm thickness. Therefore, if an IMI plate has the same size and shape but is 2mm or 3mm thick, it is NOT PERMITTED for use.
4.3.3 Plates MAY NOT be stacked (overlapped) for the purpose of increasing thickness.
4.4 Important Note:
4.4.1 Kits such as Advanced Packs, Starter Packs, or any kits that come equipped with FRP/HG plates, dampers, brakes, and similar parts ARE PERMITTED for use. However, ALL FRP/HG plates from such kits MUST BE REDUCED to 3 (three) pieces only to comply with the rule above.
4.4.2 Therefore, the assumption that "buying an Advanced Pack alone is enough to join a Pro Stock race" is NOT ACCURATE, as plate reduction is MANDATORY to meet class specifications.

05 ROLLERS & DAMPERS (MALAYSIA AMENDMENT)

5.1 Only pure plastic rollers are permitted. Aluminum rollers or metal rollers with rubber rings (metal rubber rings) are STRICTLY BANNED.
5.2 THERE IS NO LIMIT ON THE NUMBER OF ROLLERS. Participants are free to install as many plastic rollers as desired.
5.3 IMI plastic rollers are permitted subject to the organizer's discretion, as long as they follow the original size and shape issued by Tamiya.
5.4 Self-painted rollers are NOT permitted (to facilitate material inspection).
5.5 Removing the rubber ring from rollers is PROHIBITED (if the roller originally comes with one).
5.6 Roller or damper shafts that are intentionally bent or cut are NOT permitted. However, angle adjusters (e.g., #15373) are permitted to adjust the angle of rollers/dampers without bending or cutting the shafts.
5.7 Spacers (plastic/metal) are permitted.
5.8 Rollers may be mounted using kit-supplied roller shafts or IMI.
5.9 THERE IS NO LIMIT ON THE NUMBER OF STANDARD DAMPERS. Participants are free to install as many standard dampers as desired.

06 GIMMICK ITEMS

6.1 Gimmicks/special movement mechanisms are NOT ALLOWED in the Pro Stock class.
6.2 A gimmick is any component or arrangement that alters the car's behaviour beyond the original function of Tamiya parts — including mass dampers, sliding dampers, pivot suspensions and similar.
6.3 Only Tamiya components used for their original function are permitted: rollers, standard dampers, FRP/HG plates and spacers.
6.4 Examples of prohibited gimmick items: Tamiya 15467 — Wide Rear Sliding Dampers (★440); Tamiya 15478 — Mass Damper Set w/ Ball Connectors (★520).
6.5 Scrutineers may require gimmick components to be removed before the car is allowed to race.

Note: Examples of gimmick items may be updated from time to time or are subject to the organiser's discretion.

07 BEARINGS

7.1 METAL BALL BEARINGS ARE STRICTLY BANNED.
7.2 This includes:
7.2.1 Metal ball bearings on wheel axles.
7.2.2 Metal ball bearings on counter gears.
7.2.3 Metal ball bearings on rollers.
7.3 Only original plastic bushings from the Tamiya kit or original metal eyelets are permitted (strictly as standard replacements).
7.4 Plastic bearings ARE PERMITTED.

08 GEARS & TRANSMISSION

8.1 Gearing MUST follow the official Tamiya gear chart. Mixing different gear ratios is PROHIBITED.
8.2 Using a metal pinion gear is NOT permitted.
8.3 Using a hollow propeller shaft (hollow drive shaft) is PERMITTED.
8.4 Reinforced carbon crown gears ARE PERMITTED.
8.5 Mixing orange crown gears and pink crown gears is NOT permitted.
8.6 Pairings of Counter Gear and Spur Gear other than those specified in the official Tamiya gear chart are NOT permitted. For example, for a single-shaft motor, if a 3.7:1 counter gear (G-24) is paired with a brown spur gear (G-11), this is NOT PERMITTED.
8.7 Floating gears are NOT permitted.
8.8 Wheel shaft length must be 60mm (except for Super X / Super XX which use 72mm).

09 TIRES & WHEELS

9.1 Minimum ground clearance: 1mm.
9.2 Wheel size (tire + rim) between front and rear MUST be the SAME.
9.3 Tires and rims MUST be the SAME SIZE (e.g., small rim with small tire).
9.4 PERMITTED tires:
9.4.1 Solid rubber tires (non-sponge) of standard size are PERMITTED.
9.4.2 Mixing tires of different types but same size is PERMITTED (e.g., Low-Friction & Super-Hard).
9.5 PROHIBITED tires:
9.5.1 Tires MAY NOT be modified: they cannot be sanded, trimmed, reduced in size, or altered in shape.
9.5.2 Sponge tires are NOT PERMITTED.
9.6 PERMITTED rims:
9.6.1 Rims must be plastic or carbon (not metal).
9.7 PROHIBITED rims:
9.7.1 Rims MAY NOT be modified: they cannot be punctured, cut, or altered in any way.
9.8 PERMITTED wheel sets:
9.8.1 Tires may be taped to the rims using double-sided tape.
9.8.2 Standard wheel sets (original tires and rims) are PERMITTED.
9.9 PERMITTED wheel sets (conditional):
9.9.1 IMI tires and rims are PERMITTED subject to the organizer's discretion, as long as they follow the original size and shape issued by Tamiya.
9.10 PROHIBITED wheel sets:
9.10.1 Reverse wheel sets are PROHIBITED.

10 BATTERIES & ELECTRICAL

10.1 AA Alkaline (1.5V) or Rechargeable (1.2V) batteries ARE PERMITTED. Any changes or relaxations are subject to the organizer's discretion.
10.2 Gold terminals are permitted. Double stacking (layering) of terminals is PROHIBITED.
10.3 Soldering directly onto battery terminals is PROHIBITED.

11 RACE OPERATIONS & INSPECTION

11.1 Start Procedure: Racers will hold their machines in the air with one hand and drop them vertically into their assigned lane at the start signal, or using a starter box provided by the organizer. Throwing or pushing the machine forward is PROHIBITED.
11.2 DNF (Did Not Finish): A racer will be declared DNF if their machine leaves the track, flips over, jumps into another lane, or if the machine's body detaches during the race.
11.3 Victory Condition: The winning machine must be lying flat with all four wheels on the track. Machines that finish sideways or upside down will be declared DNF.
11.4 Inspection: A full inspection will be conducted according to the organizer's discretion. Any violation may result in Disqualification.
11.5 Objections: Participants may raise objections to race officials, but objections must be made during the race and before the next race begins.

12 MACHINE INSPECTION

12.1 A minimal inspection can be done during the elimination rounds at the organizer's discretion if deemed necessary. If any part of the machine is determined to be against race regulations, the racer will be considered to have lost the corresponding heat. If the racer has not reached his/her maximum losses, the racer may make the required modifications and participate in the racer's next heat.
12.2 A full inspection may be conducted at the quarter-finals if deemed necessary by the organizer. Any violation may result in Disqualification of the racers.
12.3 From the time the machine passes the machine inspection to when the race begins, the machine's settings must not be changed and no modifications can be made.
12.4 In addition to the pre-race machine inspection, other machine inspections may occur at any time during the race day at the race official's discretion. If the machine is found to be in violation of the race regulations at any of these inspections, the racer's race results up to that point will be disqualified and the racer must make necessary changes in order to participate in subsequent races.
12.5 If a machine does not pass machine inspection, and cannot be made race-legal, the participant CAN NOT take part in the Qualifying rounds.

13 DISQUALIFICATIONS

If any of the following situations occur, race officials will, at their discretion, have absolute authority to disqualify any racer. Please adhere to race etiquette and uphold the spirit of sportsmanship to avoid any issues.

13.1 A racer's machine is determined to have modifications that will cause physical harm to other racers, other machines, or the race track.
13.2 A racer's machine is determined to have modifications that are designed to deliberately obstruct other machines.
13.3 A racer deliberately puts grease or other substances onto the track or machine to affect track surface conditions.
13.4 A racer is determined to have modified their machine after it passed machine inspection. For example, removing O-rings from rollers.
13.5 A racer is determined to have deliberately touched the track or machines to impede other racers' race progress.
13.6 A racer does not follow the instructions of race officials or otherwise impedes the operations of the race track.
13.7 A racer has a false start, or is determined to have thrown or pushed their machines forward at the start of a race.
13.8 A racer is determined to have acted against the spirit of fair play or caused distress to other participants.
13.9 The racer is found to have violated the Golden Rule (using non-Tamiya chassis and gears or modifying parts beyond the permitted specifications).

14 FINAL AUTHORITY & DISPUTE RESOLUTION

14.1 In the event that a dispute, objection, or decision cannot be resolved through the existing rulebook, the organizer's judgment, reached through deliberation (musyawarah), shall be the final reference.
14.2 The organizer's decision is FINAL and BINDING. No further appeals will be entertained once a decision has been made by the organizers through this process.

📌 FINAL NOTE: This document is the latest updated version of the Malaysia Pro-Stock Rules. Any further changes or amendments will be announced by the organizers from time to time.

⚠️ IMPORTANT NOTICE (Additional Rule): Any changes or relaxations to these rules are subject to the organizer's discretion. The organizer MUST provide official prior notice before the tournament begins. Participants are advised to always refer to the latest announcements from the organizer.