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The increase of one horsepower over the GC160 and GCVl60, to 6.0 horsepower and 6.5 horsepower for the GC190 and GCV190 respectively, was achieved through an increase of displacement from 160 to 187 cc. This also results in a 0.5 lb.ft. torque increase for both engines, with the battery GC190 delivering 8.9 lb.ft., and the GCVI90 delivering 8.1 lb.ft.To maintain reliability with the higher output, internal components have been strengthened with a stronger piston pin, larger connecting rod, larger rod journal and redesigned oil control ring.

The path of fuel flow through the system is pretty simple. Diesel fuel tanks normally are positioned above the engine''s fuel-injection pump to provide a positive pressure head to the fuel filter and transfer pump. This positioning assures easy priming of the system and assists fuel flow as the filters become more restricted. The fuel is moved by the transfer pump (usually a diaphragm type).The transfer pump, normally with the help of gravity, pulls the fuel through a primary filter and pushes it through a secondary filter before the fuel reaches the main pump. When a camshaft lobe in the injection pump lowers the plunger, the transfer pump pushes fuel into the chamber above the plunger in proportion to the position of the metering system. As the engine camshaft rotates, the injection pump plunger rises, powered pushing the fuel at high pressure out of the delivery valve, into the high-pressure fuel lines, and on to the injector nozzle. The high-pressure fuel inside the injector nozzle surrounds the valve (piston) and pushes up on the piston step against a predetermined spring setting. As the piston lifts, fuel leaves the nozzle tip and flows out the nozzle orifice into the pre-combustion chamber or cylinder.