The Early Style Starter Circuit: Electrical Troubleshooting and Basics on a Vintage Honda Motorcycle

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The electric starter circuit can be a more intimidating circuit to approach due to its inclusion of high voltage and a solenoid. With that said, when broken down it is nothing more than a few wires and switches that make it up. Similar to the headlight circuit, Honda has a early (Pre 1973) and a late (Post 1974) version of this electric starter circuit. In this article, we are going to focus on the early version of the circuit that has no safety switches. What that means is that the electric starter can be engaged when the motorcycle is in gear, causing it to lurch forward.

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Need help with your vintage Honda? Attend the CMC Repair Academy and watch the full playlist of repair videos for your motorcycle:

   • CB175/CL175/SL175/CB200/CL200  
   • CB350/CL350/SL350  
   • CB360/CL360  
   • CB450/CL450/CB500t  
   • CB500K / CB550K / CB550F  
   • CB750K / CB750F  
   • CB350F / CB400F  
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Contents of this video:
00:00 - Introduction
00:29 - Starter circuit background information
01:16 - Models compatible with this instructional
01:56 - Tracing the circiut
04:40 - Testing the start button
08:17 - Testing the starter solenoid trigger wires for continuity
10:01 - Testing the main starter solenoid contacts
14:05 - A Working circuit demonstration
14:40 - Final thoughts