Lastly, it has better specific power than a four-stroke engine. Moreover, since it has fewer moving parts, it has lower inertia, meaning it can start and rev faster than a 4T.

A Yamaha YZ400, 5-valve, 4-stroke cycle, motocross racing, motorcycle engine is instrumented to provide pressure diagrams in the exhaust system which are recorded over the usable engine speed range at ...

SAE Transactions, Vol. 104, SECTION 6: JOURNAL OF PASSENGER CARS, Part 2 (1995), pp. 2571-2580 (10 pages) Experimental studies of the intake-generated charge motion (swirl and tumble) and engine ...

The motorcycle engine has come a long way from its auspicious 19th-century beginnings, evolving over the years to include many types that still exist today.

Over the last few years, there’s been a resurgence in the popularity of two-strokes engines, even though competitive riders continue to rely on four-stroke power. So which is preferable?