Both of these scooters used a Briggs model 140000 6hp motor (142300, 146400, 147400, etc). A model 170000 7hp or 190000 8hp will also fit. Make sure the motor has the right shaft. The Blazer used a 'Marco Klymomatic' clutch, the Sherpa used a Salsbury 500 (Comet 500). Not sure about the belts.