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Post by Critter from the Rock on Aug 8, 2021 14:23:53 GMT -5
Hey everyone, I recently bought two mopeds a 50cc and a 150cc they had been sitting up for a couple years, anyway I managed to fix the 50 and sold it, but the 150 I wanted to keep and I had it running and rode it around the block and found the front bearing was bad so I replaced it. Now all of a sudden I have no spark and unplugging the stator and putting my multimeter on it. I'm not getting enough out of the red and black wire, so I replaced the stator, with another used one I had, but it to gives no spark and will not read nearly anything, about same readings as the other one did. Fact it's almost identical readings on all the wires as the other one before it. You think that the flywheel somehow is the problem?
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Post by scooter7878 on Aug 8, 2021 15:28:28 GMT -5
I'm not exactly sure what the readings should be but the red and black powers the cdi I believe it's blue and white is the crank sensor/trigger green is ground. In some models there's a 6th wire on the cdi which kills spark from either a kick stand switch or some other type of safety feature. The blue/white from crank sensor is a low voltage which triggers cdi for #1 tdc spark the voltage can be affected by the air gap between sensor and the trigger hump on the flywheel. The flywheel is probably not the issue I've nvr seen one bad unless physically damaged. U can Google no spark and find out what voltage both wires to cdi should have and also there's a air gap spec for the crank sensor between the trigger and sensor that being off will kill spark. Any other? Feel free to ask
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Post by scooter7878 on Aug 8, 2021 15:31:58 GMT -5
Also I would have to look up diag procedure but I believe if u check it with stator unplugged it may not be correct bc the ground will be disconnected also I'm not sure if it's supposed to be plugged in or un plugged but I believe with the ground unplugged u won't get correct readings there's a lot of info on YouTube on checking that
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