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! 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 works on single cyl. 2 and 4 cycle equipment. Use needle nose pliers to loosen stuck fuel lines. Work them back and forth to loosen it. Check the compression occaisionly to detect leaking valves. A cylinder leak-down test can be VERY useful to detect leaking intake or exhaust valves and also leaking rings and head gasket. Harbor Freight has a compressor which provides plenty of air to check leakdown. It is about 22 gallon or more.