Post by lostforawhile on Oct 12, 2017 0:53:32 GMT -5
Yiben Scout YB50-QT3
Ok I have done everything to get this bike running again, cleaned the carb, changed the CDI out, changed the coil out, checked the valves, changed the gas, I have compression, fuel, and spark with a plug outside of the cylinder, but the engine won't fire even once, I have exhausted every explanation i could think of, the only thing left is a weak charge coil on the stator, that is letting the CDI fire the coil, but at a lower voltage. The CDI can only step up the voltage depending on what it's given. I've been having issues where the bike would run great, then suddenly run worth a crap, it would miss, backfire, etc. My plug had been looking good, but when I pulled it this time, it was fouled, probably by a misfire. I replaced the CDI with a factory high quality one, which is the only CDI that will work on this bike, I just replaced the coil with a Suzuki coil and wire, which is very close to the factory one, but much better quality, it fires fine. I've cleaned the carb, and installed a new jet, which I was going to tune, but it never started again, it should be set well enough to at least run, or start. it's like the ignition system took a crap, the only thing left is the stator , I'm getting about 30 volts to the CDI while cranking,which seems low, but will fire a plug . The fact that a grounded plug will fire, takes the kill switch out of the equation, a bad cdi out, a bad coil out, there may not be enough voltage to fire under compression , I did notice that the charge coil voltage dropped from 79 while cranking open circuit, to 30 with the cdi connected, some voltage drop is normal but that's a lot
Read more: 49ccscoot.proboards.com/thread/20129/weak-stator#ixzz4vGogUzdn
Ok I have done everything to get this bike running again, cleaned the carb, changed the CDI out, changed the coil out, checked the valves, changed the gas, I have compression, fuel, and spark with a plug outside of the cylinder, but the engine won't fire even once, I have exhausted every explanation i could think of, the only thing left is a weak charge coil on the stator, that is letting the CDI fire the coil, but at a lower voltage. The CDI can only step up the voltage depending on what it's given. I've been having issues where the bike would run great, then suddenly run worth a crap, it would miss, backfire, etc. My plug had been looking good, but when I pulled it this time, it was fouled, probably by a misfire. I replaced the CDI with a factory high quality one, which is the only CDI that will work on this bike, I just replaced the coil with a Suzuki coil and wire, which is very close to the factory one, but much better quality, it fires fine. I've cleaned the carb, and installed a new jet, which I was going to tune, but it never started again, it should be set well enough to at least run, or start. it's like the ignition system took a crap, the only thing left is the stator , I'm getting about 30 volts to the CDI while cranking,which seems low, but will fire a plug . The fact that a grounded plug will fire, takes the kill switch out of the equation, a bad cdi out, a bad coil out, there may not be enough voltage to fire under compression , I did notice that the charge coil voltage dropped from 79 while cranking open circuit, to 30 with the cdi connected, some voltage drop is normal but that's a lot
Read more: 49ccscoot.proboards.com/thread/20129/weak-stator#ixzz4vGogUzdn
