1. The two vortices also remain independent layers throughout most of the compression stroke . 2. It also closes the intake valves sooner on the compression stroke . 3. First, it travels downward on the intake stroke, then up on the compression stroke . 4. Injection was timed to occur at or near the peak of the compression stroke . 5. The intake stroke is followed by the compression stroke . 6. The piston then moves downward, where the air-fuel mixture remains from the previous intake-compression stroke . 7. However, it injects fuel later, during the compression stroke . 8. Then the compression stroke starts and the cycle repeats. 9. Near the end of the compression stroke , the layers collapse into uniform minute turbulences, which effectively promote lean-burn characteristics. 10. Two-stroke motorcycle engines, where the arrangement helps to prevent reverse flow back into the intake port during the compression stroke .
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