Patent ID: 7556019

Claim:
An engine system configured to provide a plurality of engines having different power outputs at the same selected speed, the engine system comprising: a first engine having a first power output at the selected speed, the first engine including a first engine housing; a first crankshaft rotatably supported in the first engine housing; a first cylinder; a first piston movable within the first cylinder; a first combustion chamber in fluid communication with the first cylinder; a first carburetor configured to provide fuel to the first combustion chamber; a first intake manifold including an interior wall at least partially defining a first passageway between the first carburetor and the first combustion chamber, the first passageway configured to deliver an air/fuel mixture to the first combustion chamber, the first passageway having a first cross-sectional open area, the first intake manifold formed as a single piece; a first aperture in the interior wall of the first intake manifold; a first regulator received in the first aperture and at least partially positioned in the first passageway to effectively decrease the first cross-sectional open area of the first passageway, the first regulator selected such that the first engine operates at the first power output at the selected speed; a first coupling device configured to maintain the first regulator in the first passageway, and configured to enable removal of the first regulator without disassembly of the first passageway; a second engine having a second power output at the selected speed that is different from the first power output, the second engine including a second engine housing; a second crankshaft rotatably supported in the second engine housing; a second cylinder; a second piston movable within the second cylinder; a second combustion chamber in fluid communication with the second cylinder; a second carburetor configured to provide fuel to the second combustion chamber; a second intake manifold including an interior wall at least partially defining a second passageway between the second carburetor and the second combustion chamber, the second passageway configured to deliver an air/fuel mixture to the second combustion chamber, the second passageway having a second cross-sectional open area, the second intake manifold formed as a single piece; a second aperture in the interior wall of the second intake manifold; a second regulator received in the second aperture and at least partially positioned in the second passageway to effectively decrease the second cross-sectional open area of the second passageway, the second regulator selected such that the second engine operates at the second power output at the selected speed; and a second coupling device configured to maintain the second regulator in the second passageway, and configured to enable removal of the second regulator without disassembly of the second passageway.