Yeah jrzmac, it is a Briggs 5hp (all Briggs were silver for the Taco models). Near the bottom of that page, there is an HPE Slingshot with a 3.5hp Tecumseh engine and is black in color. Tecumseh seemed to have manufactured their engines in many colors... I am still leaning towards the "white" Tecumseh engine for the 1970 Taco 22 model as pictured on the steenstacominibike.com website.
Does anyone know (for certain) what the original color was on the Tecumseh 4hp engine put on the 1970 TACO T100??? White or Silver...