Two-Stroke Ignition Redesign for Yamaha KT100 Engine

Abstract

This report details research and development put into the ignition controller in place for a two- stroke racing engine. The project involved reverse engineering and documenting a transistor-controlled ignition (TCI) module currently used on the Yamaha KT100 engine. A theory of operation as well as design details of the original unit are discussed. Using the knowledge of the engine, the unit is completely rebuilt to allow a programmable spark advance curve to be implemented. The new unit is a direct drop in replacement on the engine. The theory of operation and design details of the new unit are discussed extensively. The new unit adds value to the engine as it allows the user to tune the engine to gain performance under certain conditions.