Abstract: A combination valve assembly is adapted to being an interface for filling and relieving excess pressure from a closed fluid system such as a propane tank, and to enable the regulation of fluid height within the closed fluid system via a dip tube and a bleeder set screw. The system generally comprises a pin valve element, an insert shell element, a main housing element, a relief system, and a dip tube member in fluid communication with an overfill port in the main housing. The dip tube member may be adapted to extend outward of the distal end of the man housing element.

Abstract: A transfer passage design for a two stroke internal combustion engine that allows for regulation of the air/fuel flow as the piston nears the bottom of its stroke. Additionally, a cut out in the skirt of the piston may allow for additional gaseous communication between the crankcase chamber and the transfer passage.

Abstract: A protective cap for a tank, such as a LPG tank, with a valve normally at the top. The protective cap covers the top of the tank in a fashion to protect the valve. The protective cap may have ribs that enable for stacking of the tanks on top of one another. The ribs also allow for easier handling, such as hooking onto. The protective cap may also have a protrusion to provide a secondary seal to the main service valve of the tank.

Abstract: A lubricating system for a two-stroke engine is provided in which oil is more reliably pumped into the two-stroke engine. The oil travels through passages that are integrally cast into the cylinder and/or crankcase. The oil may be injected directly into the crankcase chamber or intake passage. The oil pump may be a rotary pump mounted on the crankcase concentric to the crankshaft. It is also possible to not use an oil pump, and have the oil drawn into the engine by vacuum created in the crankcase.