My bike is running too rich. I have the "E" clip on the highest setting, and it's still causing a black plug. I get the feeling it's because Zoom uses the same carb on their 49cc and 66cc engines.
Rejetting the carb seems to involve calipers and really tiny drillbits- two things I don't have. This is where I ask the experts here: Is there a simple way to lean out the fuel:air mixture? I've tried taking off the air filter and closing the fuel petcock, but it didn't make much of a difference at all (the fuel flows better with the petcock closer to the "off" position). I was thinking of drilling a really small hole somewhere to create an intentional air leak, but I'm sure that's a stupid idea.
Rejetting the carb seems to involve calipers and really tiny drillbits- two things I don't have. This is where I ask the experts here: Is there a simple way to lean out the fuel:air mixture? I've tried taking off the air filter and closing the fuel petcock, but it didn't make much of a difference at all (the fuel flows better with the petcock closer to the "off" position). I was thinking of drilling a really small hole somewhere to create an intentional air leak, but I'm sure that's a stupid idea.