Here's an excellent service manual to have. Maybe Mike can keep this thread up top permanently for us to refer to. This Tecumseh Service Manual covers the HH series engines, like the HH120 in the Newt the Bold, Trailblazer, etc, and the OH series that were in many machines like early Max II and MaxIV's, late model Scramblers, Swamp Fox, and late model Attexes.

http://www.wfmfiles.com/download/Tec...691462A%29.pdf