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four-stroke |
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four-stroke relating to or designating an internal-combustion engine in which the piston makes four strokes for every explosion How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Snowmobiling was once considered an environmental hazard, mainly because of the two-stroke engines which have since graduated to four-strokes, reducing the pollution levels considerably. Studies have emphasized the cleanliness of four-strokes when compared to two-strokes, but no studies have been done to examine the effects of four-stroke engines on their own. Four-strokes are cleaner and quieter, but have historically lacked the low-end torque needed to quickly get a boat on plane or efficiently tow skiers. |
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