Get here
http://www.harborfreight.com/cpi/ct...Itemnumber=5646
http://www.harborfreight.com/cpi/ct...?Itemnumber=623
But in the pict I'm measuring the Crank. You need to instal the fan & slowly turn it on the crankshaft to find the sweet spot when pulling the pull starter cord. On mine I had to use some tin-foil to get it shimmed right. Might I add the Most BS part of owning a Gasser if you ask me!! But Very important to do, ask me how I know!
You can pick one up @ harbor freight tools cheap that will get the job done for ya!
and one more thing "DON'T BE AFRAID!"