They are a clone of a yamaha unit as for the carb they are a fixed main jet unit the only adjustment is the idle mixture they run at 3100 rpm to produce 230 volts.True parts are not available- easily at least but my own unit has nearly 1000 hours on it now all i've replaced is the starter cord apart from cleaning the air filter it has received no maintanence at all
[This message has been edited by Garth Elder (edited 08-05-2005).]
