yes its a propance clark engine, sweeper vac, the history on the machine is vague, and has been through a few hands. I dont know the repair history, but several have worked on it trying to get it to run. it has good compression, Ignition timing is correct, and its getting fuel, this led me to cam timing. It does use the same distributor as a 3930, which is brand new electronic.IT will backfire when the ignition timing is way off, but thats all I can get it to do. This belongs to a church, several professional mechanics have worked on it, we are all scratching our heads. I will check for engine #s in the morn. The only thing I found online was a youtube video for setting the timing on a 9600, the internals look Identical .