beta rider

Whats the best way to maintain my beta carb? After having taken it off how do I clean it properly and is it necessary to do this every time the bike is used and cleaned? I always clean the air filter but is it also necessary to clean out the air box. If so how oftern is it necessary to do so?

I require some advice! I own a 2004 rev 3 which I have owned since new and have used about 12 times. While I was out practicing the bike died and I later found it would'nt produce a spark. I've tried all the obvious things like changing the spark plug and checking electrical connections. I've contacted Lampkin imports and he has sent me a new CDI unit and stator plate to swop with the ones on my bike under warranty. Having removed the flywheel and changed the stator can anyone gave advice on how to set the ignition timing? I presume it is via the small hole on the fly wheel and stator plate. Thanks, A frustrated beta rider.