Latest Honda Technical Regulations (source: hondacadt..co.uk)

Briggs & Stratton Racing Performance Catalog & Reference Guide

How to Identify a T1 and T2 Honda Engine (source: hondacadet.co.uk)

 

Honda GX Carb Flow Diagram (source: hondacadet.co.uk)

Honda GX torque Values (source: hondacadet.co.uk)