For the last few years, Dunlop tires have absolutely dominated professional motocross and supercross racing. Nearly every top rider at each AMA event is running a Dunlop, and the tire giant is often one of the first entities that a rider gives credit to from atop the podium.
Modern four-stroke dirt bike engines have a strong lineage in F-1 and Indy car racing. Yamaha’s partnership with Toyota and Honda’s collaboration with Mugen has given us some incredible dirt bike engines. The average 250cc four-stroke revs to 13,400 rpm. At that rpm
In the second part of our series on four-stroke valve trains we spotlight the characteristic problems with late model bikes. Now that these bikes have been on the market for at least three model years, dirt riders have tortured these bikes in all sorts of conditions. The information expressed in this article is based on the author’s experience at operating an engine rebuilding business. By examining engine failures, usage patterns, and interviewing customers on maintenance practices, the author has formed opinions on the potential
Safety Tips To Preventing “Stuck Throttle Condition STC”
By Eric Gorr
It’s a riding situation that most riders have experienced. The lack of control that makes riders panic when the engine runs wide open uncontrollably. This is often called “stuck throttle condition” or STC.
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