It depends on the version of the engine.
 
	If there is no vaporiser it is designed to work on petrol.
 
	If it has a vaporising box it will run on both petrol or TVO but may not like straight petrol due to lower compression ratio and fuel getting to hot.
 
	If there is a cox atomiser still fitted to the vaporiser and you only want to run on petrol it may be best to remove it.
 
	 
 
	Neil