i have a 1981 honda cb900 custom i just got the bike like a month ago and i cant get it to start it is getting fuel and has good fire the air filter isnt clogged the ignition fuse and main fuse is good and the battery is brand new it was cranking fine for about a week then the next day nothing i cant think of anything else to check or what would cause it to stop all of a sudden any help would be appreciated