While you wait for answers, we may have found some information which could help you.
Click here for Plug 35 EngineMy Tecumseh BVS 143 Engine is spluttering and cutting out?
need parts for Vantage 3.5hp Tecumseh?
Engine manual required?
How can I get the engine to run smoothly?
How to remove a pulley from a 12 hp tecumseh eng?
Replacement clutch cable fitting - Tecumseh Vantage 35 Tiller?