Engine decompressor4/10/2023 ![]() ![]() įrom the mid-1960s to the late-1970s, engine compression releases were also used to supplement rear wheel braking on many two-stroke engined motorcycles, primarily those used off-road or for various types of dirt-track racing, such as motocross and flat-tracking. This reduces the work of cranking the high 12.5:1 compression ratio engine, allowing a smaller battery and smaller starter motor, for a total weight saving of 3.3 kilograms (7.3 lb). Though it only uses electric start, not kick start, the 2012 Ducati 1199 uses a compression release, which is automatically activated at low engine speed by a centrifugal flyweight on each exhaust cam. At that point the valve closes and the ignition is engaged.Įarly large displacement motorcycles provided riders with a manual control for this when kick starters were used while later models linked them to the kick start lever through a cable for automatic operation. It does this through a release valve that is incorporated within the cylinder head that vents the cylinder pressure to the outside atmosphere until the engine has sufficient momentum to overcome it. The decompression valve (black lever) on a Yanmar YSB8 marine diesel engine.Ī compression release mechanism works to ease the starting of internal combustion engines by allowing them to spin up to starting speed without having to work against the pumping action of the pistons. ![]()
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