Well -if the ignition runs fine - then I would fly it til it doesn't. If the included ignition is a CH unit, and you wanted to get away from the mechanical advance, you just need to figure out a way to lock your timing ring at ~27-30degrees Before top dead center. follow CH's instructions here:
http://www.ch-ignitions.com/CHinst.html. You can purchase the separate Syncro spark module for about $30.
Even the mechanical advance and syncrospark units aren't absolutely needed - the engine should run without it - but the advance units retard the timing at idle to help with idle characteristics and starting.
Edit:
And yes, walbro carbs are pretty easy to rebuild and maintain. Zama's are pretty similar. Those are the only 2 brands I'm familiar with. there will be a model # stamped on the carb somewhere, and then all you need to do is start searching for a rebuild kit - Ebay is a good source, I'm sure there are others.