Howzitgoin' eh!
I'm just getting my 66cc China Girl together, and have a used CDI unit I want to use.
I have tested the magneto with an ohmmeter and it appears good (330 ohms). Rotor magnet is strong too. I'm using a variable autotransformer (variable voltage AC supply) to test the CDI module.
Now, the CDI unit appears to work well, delivering nice fat sparks with a 'pop' at the 60 Hz line frequency. Thing is, I have to apply about 50 to 60 volts AC to the black and blue wires to fire the spark plug. Plug gap is 0.024" (0.6mm).
Does this sound right? When I try to start the engine, if there's any problems, I want to know if my CDI module is marginal and needs to be replaced before I start mucking with the rest of the engine, which I have carefully assembled (compression is great, carb cleaned out, no intake or crankcase leaks etc.)
The Grubee "magneto mystery" page says that the 6 volt lighting coil has ~400 turns of wire, and the ignition winding has ~4000 turns, so since there's 10 times as many turns, the ignition side should be able to produce roughly 60 volts to fire the CDI unit. So, I'm in the ballpark.
Sound good? I need to know what to expect here and any input from knowledgeable people is much appreciated!
I bought 2 of these engines for a hundred bucks and pulled both all apart, picking out the best bits for a rebuild, meticulously cleaned, inspected and reassembled a complete engine with considerable care. I'm looking forward to seeing it go. I know I could have saved a lot of time by buying a new kit, but at least I know what I have now, and as far as China Girls go, it seems like one of the higher-class whores
Any ideas about the condition of the CDI unit? Sounds OK to everyone?
Peace
Ian
I'm just getting my 66cc China Girl together, and have a used CDI unit I want to use.
I have tested the magneto with an ohmmeter and it appears good (330 ohms). Rotor magnet is strong too. I'm using a variable autotransformer (variable voltage AC supply) to test the CDI module.
Now, the CDI unit appears to work well, delivering nice fat sparks with a 'pop' at the 60 Hz line frequency. Thing is, I have to apply about 50 to 60 volts AC to the black and blue wires to fire the spark plug. Plug gap is 0.024" (0.6mm).
Does this sound right? When I try to start the engine, if there's any problems, I want to know if my CDI module is marginal and needs to be replaced before I start mucking with the rest of the engine, which I have carefully assembled (compression is great, carb cleaned out, no intake or crankcase leaks etc.)
The Grubee "magneto mystery" page says that the 6 volt lighting coil has ~400 turns of wire, and the ignition winding has ~4000 turns, so since there's 10 times as many turns, the ignition side should be able to produce roughly 60 volts to fire the CDI unit. So, I'm in the ballpark.
Sound good? I need to know what to expect here and any input from knowledgeable people is much appreciated!
I bought 2 of these engines for a hundred bucks and pulled both all apart, picking out the best bits for a rebuild, meticulously cleaned, inspected and reassembled a complete engine with considerable care. I'm looking forward to seeing it go. I know I could have saved a lot of time by buying a new kit, but at least I know what I have now, and as far as China Girls go, it seems like one of the higher-class whores
Any ideas about the condition of the CDI unit? Sounds OK to everyone?
Peace
Ian