clean the carb and make sure the float isnt stuck.

 

adjust your valves while you are at it

 

Did you say it wasn't fireing? Pull the plug, or unplug the plug wire and put a plug in the plug wire. Be sure the plug is grounded and spin the bike over while watching for spark. If you have a good spark then the problem could be timing, fuel or compression. If no spark then check the obvious things first. Kill switch etc. I am not up on your particular machine, but if you get a service manual from some where it should give you some trouble shooting advice.

 

Since you just installed a cam, there is the possibility something came loose, or the timing chain may have jumbed. Check the engine compression, the cam timing, and the valve adjustment. Also look for a bent valve.