Manuals and Technical Database for Racing Go Karts, Mini Bikes and Racing Lawnmowers

Knowledge is power and in this case its horsepower. Search our technical page for manuals, articles, guidelines, and information that will help you better understand your small engine-powered application and your motorsport.

For EC Racing Products Manuals & Resources


Metric/US Unit Conversion

Engine Displacement Calculator

Kart Gearing Calculator

Jackshaft/Right Angle Gearbox Calculator

EC Transmission Calculator


Mikuni Manuals and Info

Tillotson Manuals and Info

Walbro Manuals and Info

EC Birt Archives


Briggs and Stratton

Honda OEM




Vortex - ROK

Clutch, Torque Converter & Drivetrain

Comet Industries Torque Converter

Hilliard Centrifugal Clutches

Noram Centrifugal Clutches

Salsbury Torque Converter

SMC Centrifugal Clutches

Rulebooks and Organizations

2020 Tillotson T4 T225RS Rule book

2020 NKA Rule Book

2020 USLMRA Lawnmower Racing Rule Book

2021 USLMRA Lawnmower Racing Rule Book

LTO/Oval/Speedway Karts

Phantom Chassis

Ultramax Chassis

Sprint/Road Course Karts

Arrow Karts

BirelART - Ricciardo - Kubica Karts

CRG Karts

Intrepid Karts

IPK - Praga Karts

Italkart Karts

Kosmic Karts

Margay Karts

Monaco Karts

OTK - Tony Kart

Sodi Karts

SWRD - Wright Karts

VLR Karts

Recreational Carts & Mini Bikes

A.C.E Sports

American Landmaster

Baja Powersports

Carter Bros

Coleman Powersports

Hammerhead Offroad



Mega/Monster Moto



Yerf Dog

Racing Lawnmowers

Peerless Transmission & Gearbox

Race Mower Info