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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
CDI, Coil, and stator . . . what does each one do?
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[QUOTE="Jones, post: 530446, member: 20895"] I'm trying to diagnose a problem with a 88 kx 500 that used to be mine, but now belongs to a friend. The bike will not produce power under load, but it starts on the first kick and has good throttle response. As the load increases, it begins to stumble and sound like its running rich. Climbing hills just doesn't happen. I believe it's an ignition problem now, but just to paint a clear picture here's whats been done to try and remedy the problem; Air filter replaced Entire fuel system cleaned and checked - including float height Reeds checked Piston and rings replaced power valves cleaned and reinstalled with marks aligned So . . . the manual says a weak magnet in the stator can come from age. I'm thinking that enough of a magnetic field is there to get a good spark at idle and slightly above (where it runs perfectly) but not enough to generate enough current to run the advanced ignition curve as rev's increase. BUT . . .I only have a dangerous amount of knowledge. I teach highschool science, and get the ideas of how the ignition works, but I don't know where each piece contributes to the whole package. Also, I am mechanical enough to know that the best information for solving these problems is not theoretical, but comes from the guy whose done it before . . . The stator generates the electricity for the plug, but how does the CDI control ignition and where does the coil fit in? Does the coil just get the charge right for the plug? This is where I get lost . . . Just think - If you straighten me out, I can help hundreds of dirtbiking kids and we'll have a whole generation of great bike tuners out there! (school teachers always dream of inspiring the next Einstein . . .or Honda or Showa or Gorr . . .) Thanks in advance. Jones [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
CDI, Coil, and stator . . . what does each one do?
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