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PF, Although I own an NAA instead of a 9N, there are some steps I've gone through in the past when I had a similar problem. Check to see if the plugs are wet with gas after cranking for a while. If they are wet, there may be a timing or electrical problem. If the plugs are dry, it's obvious the gas isn't getting where it's supposed to. Before rebuilding the carb, start from the beginning by checking to make sure you have gas flowing from the tank. Make sure the fuel valve is turned off. Disconnect the gas line from the carb and the fuel bowel. Pull off and clean the fuel bowel. With a small cup underneath the bowel/valve assembly, open the valve to make sure gas is getting out of the tank. If not, there may be an accumulation of sediment in the tank which needs to be cleaned. Second thing to do is use compressed air to blow out the fuel line to clear anything which may have plugged it up. Reassemble the fuel bowel, connect the fuel line to the assembly and turn on the valve. You should get good flow coming out of the other end (still diconnected from the carb). The last thing I'd check is the small screen in fuel line elbow into the carb. You'll need to unscrew the elbow from the carb and check to make sure the screen isn't gummed up. If all these things check out, then I'd start to look at the carb and a possible rebuild. Good luck,
RonW
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