Byron - What horsepower is this engine? I don't have my Briggs reference manual at hand. 5 hp is the minimum I would recommend for a Merry. Optimally I would use an I/C class engine. This has a steel sleeve in the piston. It wears much better. I actually prefer Honda engines on most of my rental equipment, but since tillers, even at a rental store, are highly seasonal, the Briggs I/C lasts just fine. Advice to all gardners - Change the oil in your engines before doing any serious work for spring. Run the engine for 10-15 minutes prior to changing oil. Then, throughout the season, change oil at 12-15 hours of operation. Clean the air filter EVERY TIME you change the oil. Kevin Crooks > > Would like to know if any CH has used a Briggs mdl 91202 > motor on a Merry Tiller roto tiller > > Thanks > Byron >