G'day from Oz
Recently I bought a second hand bike and all is sweet. My mates kid saw it and wanted one so I searched and found one for him. He rode for a while and now it doesn't work. His dad doesn't know which end of a screwdriver to use so it's come back onto me to fix it for him. The problem is you have to pedal like mad to get it to barely run and as soon as you pull in the clutch it dies. I pulled apart and cleaned the carby. No change. Pulled apart the fuel line. Cleaned off the debri around the tank filter. Blew out the fuel line, made sure filter wasn't blocked. No change. Took the carby off my bike which was running sweet. No change. Pulled the spark plug out, it was covered in oil. Cleaned it up and regapped it. Lifted the E clip on the needle to the top setting. No change. Pulled the bottom of the muffler out, cleaned out the oil. Ran the bike without the base in. Now have a little bit more power but bike still won't idle. Any less than 1/2 throttle with the clutch in and it dies. If you blow through the muffler it's clear. If you put the base back on it goes back to the way it was. I took the head off and had a quick peek to make sure there wasn't any huge scratches in the bore and all looks fine. when you pedal and dump the clutch there is definately compression. If you tape the spark plug to the side of the motor there is a spark. Put it all together and it still doesn't run. I have searched a lot of your threads and while they have been helpful in understanding how these cheap chinese motors work it still hasn't fixed the problem. I am starting to think it's more to do with the CDI or magneto. The CDI looks like it's had an upgrade compared to mine. It has a quality cable and spark plug and all connections are soldered and heatshrunk so there doesn't seem to be anything adjustable or fixable just replacing the entire thing. Where the cable comes through the casing to the magneto there are only two wires. Other threads I have read say there are three. I don't know if that's a problem because the bike runs without a baffled exhaust albeit with low power. So what do I try next besides a new motor. Cheers on a great site
Recently I bought a second hand bike and all is sweet. My mates kid saw it and wanted one so I searched and found one for him. He rode for a while and now it doesn't work. His dad doesn't know which end of a screwdriver to use so it's come back onto me to fix it for him. The problem is you have to pedal like mad to get it to barely run and as soon as you pull in the clutch it dies. I pulled apart and cleaned the carby. No change. Pulled apart the fuel line. Cleaned off the debri around the tank filter. Blew out the fuel line, made sure filter wasn't blocked. No change. Took the carby off my bike which was running sweet. No change. Pulled the spark plug out, it was covered in oil. Cleaned it up and regapped it. Lifted the E clip on the needle to the top setting. No change. Pulled the bottom of the muffler out, cleaned out the oil. Ran the bike without the base in. Now have a little bit more power but bike still won't idle. Any less than 1/2 throttle with the clutch in and it dies. If you blow through the muffler it's clear. If you put the base back on it goes back to the way it was. I took the head off and had a quick peek to make sure there wasn't any huge scratches in the bore and all looks fine. when you pedal and dump the clutch there is definately compression. If you tape the spark plug to the side of the motor there is a spark. Put it all together and it still doesn't run. I have searched a lot of your threads and while they have been helpful in understanding how these cheap chinese motors work it still hasn't fixed the problem. I am starting to think it's more to do with the CDI or magneto. The CDI looks like it's had an upgrade compared to mine. It has a quality cable and spark plug and all connections are soldered and heatshrunk so there doesn't seem to be anything adjustable or fixable just replacing the entire thing. Where the cable comes through the casing to the magneto there are only two wires. Other threads I have read say there are three. I don't know if that's a problem because the bike runs without a baffled exhaust albeit with low power. So what do I try next besides a new motor. Cheers on a great site