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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Stator not CDI? Wassup w/that?
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[QUOTE="Colorado, post: 927818, member: 60368"] Hi all, I'm in trouble with the wife and need help :uh: . I went and bought another old bike yesterday --- a hybrid '75 MX400 frame/suspension and DT400 engine with a new top and bottom rebuild (professionally done -- new old parts). I saw the ad and called, and it turned out the guy was almost on his way to buy a used CDI for it. I've got a '77 IT400 parts bike (rebuilding a '78 IT400) and said, "Hey! I've got a CDI!" :laugh: Bought the bike for about what he had in the motor, but it turned out my '77 CDI didn't match. OUCH! :bang: Bad points with the wife --- another bike that I can't ride (yet ... but she doesn't get it). Anyway, he claims that he tested the CDI by putting in a known good one, and got spark with a spark tester, but never tried to fire the bike. I know that most CDI replacements are uneccessary. 95% of the time the real problem is with the stator. I've read it here, and been told the same thing at the scrap yard I use. What I don't know is exactly what that means! The stator assembly seems to be prone to failure only in the charge and pulse coil windings as far as I can tell. Does that mean that checking resistance (I got thte factory Yamaha book with the impedance #'s with the bike) in the magneto coils will diagnose the problem? Or can something with the stator be bad even if the coils test good? I can buy a used CDI for the bike for $75. The existing one is a hard epoxy body, so I'm not sure I want to attempt a CDI rebuild like I saw described searching here. I definately would rather test the stator before springing for another CDI. I just need to know if checking resistance of the two magneto coils amounts to testing the stator. If not, what's the test? Throwing parts at the bike isn't what I had in mind. Thanks! Steve [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Stator not CDI? Wassup w/that?
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