№ files_lp_4_process_3_126652
File format: docx Character count: 6412 File size: 19 KB
Official racing regulations for the Restrictor Class detailing chassis, engine, body, suspension, weight, fuel, electronics, wings, and transmission requirements for compliant vehicles.
Year: 2026
Region / City: United States
Document Type: Technical Rulebook
Subject: Kart Racing / Mini Sprint Cars
Organization: ASCS / Local Racing Association
Target Audience: Drivers and Teams
Vehicle Class: Restrictor Class, 4-cylinder 600cc
Driver Age: 9 years and older
Chassis Requirements: Roll cage, gussets, chromoly steel
Fuel Type: Methanol only
Weight Requirements: Minimum 700 lbs including driver
Suspension and Wheels: Wheelbase 50–70 inches, rear-wheel drive, Hoosier tires
Body and Safety: Full body, firewall, minimum openings, cross brace, helmet clearance
Engine Specifications: 4-stroke, 4-cylinder, OEM 600cc, restrictor plate mandatory
Electronics: On/off switches, no radio communication, allowed aftermarket ECU only
Wing Specifications: Fixed top wing, size restrictions, parallel mounting, sideboards
Transmission: Stock gears, safety chain guards, no cockpit adjustments
Period of Application: 2026 racing season
Price: 8 / 10 USD
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A-Class Rules for 600cc 4-Cylinder Race Cars and Drivers Age 12 and Up
Category: A-Class
Eligible driver age: 12 and up
Vehicle type: 4-cylinder 600cc race car
Fuel type: Methanol
Minimum weight: 750 lbs (car and driver combined)
Wheelbase requirements: Minimum 50 inches, maximum 70 inches
Drive type: Rear-wheel drive
Tire specification: Hoosier tires only (ASCS2, KS1, RD30)
Engine specification: 4-stroke, 4-cylinder, 600cc OEM engine
Fuel restrictions: Nitro products prohibited
Communication restrictions: No radio communication with driver or car
Safety equipment: Roll cage with specified material and dimensions, cross brace for shoulder harness
Body material: Aluminum, metal, fiberglass, high impact plastic, or carbon fiber
Wing requirements: Maximum 10 square-foot fixed wing with specified dimensions and mounting rules
Transmission rules: Stock gears required for four-cylinder engines
Electronics rules: Stock ECU or approved aftermarket engine control units
Inspection authority: Technical director
A-Class Rules for 600cc 4-Cylinder Race Cars and Drivers Age 12 and Up
Category: A-Class
Eligible driver age: 12 and up
Vehicle type: 4-cylinder 600cc race car
Fuel type: Methanol
Minimum weight: 750 lbs (car and driver combined)
Wheelbase requirements: Minimum 50 inches, maximum 70 inches
Drive type: Rear-wheel drive
Tire specification: Hoosier tires only (ASCS2, KS1, RD30)
Engine specification: 4-stroke, 4-cylinder, 600cc OEM engine
Fuel restrictions: Nitro products prohibited
Communication restrictions: No radio communication with driver or car
Safety equipment: Roll cage with specified material and dimensions, cross brace for shoulder harness
Body material: Aluminum, metal, fiberglass, high impact plastic, or carbon fiber
Wing requirements: Maximum 10 square-foot fixed wing with specified dimensions and mounting rules
Transmission rules: Stock gears required for four-cylinder engines
Electronics rules: Stock ECU or approved aftermarket engine control units
Inspection authority: Technical director
Topics: RESTRICTOR 600cc 4-Cylinder