xi
Two-Stroke Engine Operation 105
Intake Event for a Reed Valve
Engine 109
CHAPTER 6
The Fuel System 113
Introduction 114
The Fuel Supply System 114
Fuel Tank 114
Fuel Filter 115
Fuel Lines 115
Fuel-Lubrication Premix 116
Fuel Delivery Systems 120
Carburetor 120
Basic Sections of a Two-stroke
Carburetor 121
Air-Fuel Control 135
Choke System 137
Purge Prime System 138
Compensated Carburetors 140
Stratified Scavenging Carburetors 140
Computer Controlled Carburetors 141
Computer Controlled Engines 142
The Emission Control System 143
History of Emission-Control Efforts 143
Emission Control Components 144
Emission Control Requirements 145
CHAPTER 7
Electricity Basics 149
Introduction 150
Electrical Principles 150
Conductors and Insulators 150
Ohm’s Law 151
Alternating Current 153
Direct Current 154
Pr efixes 154
Schematics, Drawings, and
Diagrams 154
Mag netism and Electromagnetism 156
Induction 156
Circuits 159
CHAPTER 8
Ignition Systems 165
Introduction 166
Ignition Systems 166
Points and Condenser System 166
Electronic Ignition Systems 171
Spark Plug 173
Swit ches 177
CHAPTER 9
Two-Stroke Engine Troubleshooting and
Evaluation 181
Introduction 182
Recording Equipment and Engine
Information 182
Troubleshooting Procedure 183
Verify the Customer’s Complaint 183
Perform a Preliminary Inspection 183
Quick Tests on the Engine 184
Two-Stroke Engine Evaluation 187
Engine Exterior 188
Air Intake System 191 r
Ignition System 192
Fuel Delivery System 197
Exhaust System Evaluation 204
Internal Engine Component
Evaluation 207
Repairing the Equipment 212
Final Running Evaluation 213
Reference Section 217
Glossary 228
Index 238