Yamaha Power Products – Generators, Pumps, Lawnmowers and Multi-purpose engines, are known for their reliability and easy features. At SHIMWELLS YAMAYHA we offer a wide range of Yamaha Power Products to suit every need that you have! If you would like more information, please do not hesitate to contact us.
The exhaust valve is not opened or closed as the camshaft turns but forced to open. The centrifugal force causes the decomp weight to open, and this movement lowers the pin. The lifter is not forced to be pushed up but normally moves as the camshaft turns. The exhaust valve is not opened and closed with the normal timing. Spiny sleeve is used. Since the engine block is aluminum, cast iron sleeve is fitted for more durability and less worn out. This sleeve is called spiny sleeve that has special shape. When aluminum and steel expands by heat, their expand rate is different(aluminum is more than steel). Spiny sleeve is shaped liked jigsaw puzzle and even if aluminum and steel expands in different ratio, the air pocket will not occur
