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Yamaha Badger - Hard to StartQuestion:My son has a 4 stroke Yamaha Badger that I am having a hard time starting. It has electric start and turns over with no problems, so it is not a starter or battery issue. If I roll it and pop it into gear it starts right up. Is this a CDI issue? Can I test the CDI? I can fix this myself, but I lack the expertise to diagnose the problem. Any help would be greatly appreciated. Thanks, Rob {Rob W., ME 2000 Yamaha Badger (YFM80M)} Answer:I don’t think the problem is with your CDI. When the CDI goes bad you can usually start it but the idle is all over the place & it just does not run right. It is more likely that you have a loss of compression. When you pop (push or bump) start the Badger the piston is traveling fast enough to compensate for a loss of compression that prevents you from starting the bike normally. The three main causes of compression loss are worn or broken piston rings, loose spark plug and improperly adjusted valves. We use a Motion Pro compression testing kit similar to the one shown below. This may be a bit of an investment for your own personal needs, but you can check it out by clicking on the Buy button. Good compression is 175 psi, plus or minus 10 percent, with the throttle held wide open. If your gauge shows 100 psi or less, there is your problem. Yamaha Badger CDIIn the unlikely event that your compression is good… Here are the CDI testing values you asked for. For the Yamaha Badger, the service manual lists Ω {Ohms} resistance values at 68° Fahrenheit {20° Celsius} so do not test it outside when it is freezing or if the bike has been sitting in the sun all day in the summer. Using a Multimeter or Volt Meter set to Ohms, poke the white with blue tracer and white with red tracer wires. A properly functioning CDI will give you a value between 264 and 396 Ω. For assistance with abbreviations or terms on this page, Other Possible Causes of Compression Loss
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