The Validus GRS Professional Engine Starter. The Validus GRS is our biggest engine starter yet! Professional starter for large engines up to 350cc. It features a 3″ Aluminum Nose Cone, silicone insert, and HD 6 gage wire with standard battery post connections. Double handle grips molded to fit the shape of your hand. 1-3/4 hp provides huge starting power. Stall torque is 225 inch-pounds or 3600 in-oz. 4000 no load rpm. Maximum amp draw is 600.