page_title: Suzuki T20
section_title: Posi-Force system
hierarchical_section_title: Suzuki T20 / Posi-Force system
caption_attribution_description: Français&#160;: Suzuki - T20
context_page_description: The Suzuki T20 is a motorcycle with a 247 cc, two-stroke, twin-cylinder engine, and six speed gearbox. It was first manufactured in 1965 and was produced until the end of the 1968 model year. Production peaked at more than 5000 units per month. It was superseded by an updated version which was designated the T250-1. An X6 is owned by comedian Jay Leno, and one segment of his web program called Jay Leno's Garage features his profile of the motorcycle.
context_section_description: The T20 was equipped with a 247 cc two-stroke engine, which meant that oil needed to be mixed with gasoline prior to injection into the cylinder. Simple two-stroke designs simply achieved this by requiring the user to combine oil and gas together (a solution known as pre-mix) before filling the fuel tank. However, in an advanced system like the T20, which was expected to operate for longer periods at higher RPMs, this would have been unsuitable. An excess amount of oil would be burned using pre-mix under these conditions, resulting in reduced performance and dirtier emissions, which in turn would cause the exhaust system to become laden with deposits, further reducing performance.
  The T20 solves this problem by incorporating a once-through oil injection system known as Posi-Force, which consists of an engine-driven oil pump coupled to the throttle, which is designed to provide the proper amount of oil needed at the current RPM and throttle opening. The pump draws clean oil from a separate oil tank, and pumps it through hoses into the crankcase, where it is injected into the engine outside main bearing(s) and big end rod bearings of the crankshaft.  Suzuki improved upon the system by adding oil injection directly to the cylinders on newly introduced models starting in 1968 such as the T250, T305 and the T500. Suzuki would continue to use this system on many of their two-stroke motorcycle designs. Posi Force was renamed CCI (Crankcase-Cylinder-Injection) in the early 1970s and was used until the end of two stroke street bike production in the late 1990s.
caption: Suzuki T20 at Le Salon de la Moto 2011 in Paris
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