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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
CRF 250 using oil
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[QUOTE="Rich Rohrich, post: 711776, member: 16241"] Most four-stroke engines are designed with a piston that carries two compression rings and an oil ring package (two thin rings seperated by a spacer) . The second compression ring on these pistons really serves more as an oil scraper than a compression ring. This second rind scrapes oil off the cylinder wall which helps prevent it from slipping by the top compression ring and burning in the combustion chamber. It's a common trend for ultra high speed engines to use only a single compression ring and the oil ring package in an effort to reduce friction losses and to allow the piston to be as short and light as possible to permit the high speeds these engines can safely run at. The CRF engine is designed with this current engineering thinking and only uses a single compression ring. When the engine is cold it is difficult for the single compression ring to stop all the oil. This situation is at it's worst when the engine is new, but it will always do it to some degree even when the engine is broken in. Single compression ring four-strokes always tend to use more oil then their dual ring competitors. Using a little bit of oil in exchange for performance is a good trade off in the long run for most of us. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
CRF 250 using oil
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