Thank you, I learned something new. In 1970 Wheel Horse did use a Tecumseh engine, HH120-12012C, in some of the Charger 12. For the life of me I cannot find a complete parts breakdown or diagram for this unit. When I get into the shop next week, I will check the antique shelf to see if I have something there with the Tecumseh engine. Where did you get the breakdown you are looking at? I can only find transmissions.