Repair Clinic and E-Replacement Parts have parts. E Replacement Parts has exploded views of equipment. Stens has a FULL-LINE catalog for ALL kinds of 2 and 4 cycle equipment. It is a VERY good catalog! It has parts in bulk. Amazon has parts in bulk. Amazon has a Oregon tach which you touch the spark plug wire to set the idle. It has lo and hi RPM'S. It is for single cyl. 2 and 4 cycle engines. Check Google for updated part numbers.