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[QUOTE="Brad70, post: 817332, member: 55690"]
While riding my 1998 RM125 suddenly started running very poorly, a lot of top end noise, no power, stalled whenever I let off the throttle.  I tried a new spark plug - no differnence.  I only have had the bike a few weeks, so not knowing the condition of the top end I tore it down, everything looked OK, the ring gap was a little wide but not bad.  I inspected the exhaust valves, reed valves both were OK.  I inspected the carborator, the float was low, but everything else looke OK.  I convinced myself the problem was ignition.  I pulled the flywheel and the key was OK.  I have a decent everyday multi-meter (ohm meter) and checked the coil, the secondary coil was lower than the range in the service manual, but I doubted that it was enough to casued this condition.  I checked the CDI unit, atleast 25 of the 40 some resistance tests were bad.  Obviosly I think that is the problem, but wanted to run this by someone with a little more motorcycle experience to see if this sounds logical.

thanks,
Brad
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