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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
Decompression lever????? what????
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[QUOTE="mafols, post: 1111132, member: 26583"] The decompression lever on an XR...for example is a lever on the handle bar that is pulled in to make starting the engine easier. The engine is stroked to top dead center with the kick lever. Pull in the lever, it opens an exhaust valve, and then gently push the kick lever a little to bring the engine just past top dead center, release the lever and kick. So basically you are opening a valve so you don't have to try and kick through the compression stroke...which in the case of an XR650R...really comes in handy. :) On the CRF models the decompressor is "automatic" so to speak. At the end of the cam shaft is a little "thinga-ma-jig" that works like a manual lever. You'll see two half-moon shaped weigths with springs attached. When the cam is rotated slowly...as in the case of kick starting or E-starting with the X model....a little cam hits the exhaust valve rocker arm to open the valves during the compression stroke. When the engine fires up the centrifugal force of the cam shaft spinning fast overcomes the tension of the little springs and the mechanism is disengaged. :cool: The "Hot Start" lever opens a little spring loaded plunger valve made into the carb. that allows cool ( ambient) air to be sucked in....making the engine easier to start when it is hot. Hope that helps.... :cool: [/QUOTE]
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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
Decompression lever????? what????
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