- Jun 7, 2021
The motocross bikes need a new top end every time you blink, think every 20 hours of riding or so? (Guessing a little bit). In all seriousness, it depends on how and where you ride them, and how clean and well oiled your air filter is, and how often you change the oil. The 450's should last longer, a 250f is more of a ticking time bomb. They also now have fuel injected 2-stroke motocross bikes!!!! KTM, Husky and GasGas (all mostly the same) have pretty much taken over amateur MX and off-road, but Yamaha and Honda seem to be starting a come back.And are they the type of engines that can go tens of thousands of miles with routine maintenance, or the type that need to be refreshed every other trip to the redline?
The 500 exc-F (the dual sport) will have pretty frequent recommended oil change intervals. The 701 is a newer version of the 690 engine. They recommend 6,000 mile service intervals, although I change my oil when the shifting gets a bit sticky, which is about 2,500 miles. My valves are still in spec since day 1.