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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
CR450F Top End Update
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[QUOTE="motometal, post: 394228, member: 24727"] anssi, you will note that I didn't specify that the bike had been used weekly. basically I am agreeing with Eric that the magazines, and others, have really exaggerated the low maintenance aspect of the modern four stroke race bike. At the same time, many are stuck on the mindset (which may have been accurate 25 years ago when two strokes were air cooled) that two strokes require frequent top end maintenance. This simply isn't true. I will say that logic and physics tell us that, all other things being equal, there will be parts (such as the piston) in a two stroke engine that won't last as long as the same parts in a four stroke engine. Why? well, for starters, more force (or equal force) over a smaller area equals more wear. And since two strokes require significantly smaller pistons to make equal power, it's only logical that there will be greater wear, all else being equal. If the top end lasts twice as long, but costs three to four times as much to rebuild, I would hate to list "low maintenance" or "low maintenance cost" as a benefit of a four stroke. "infrequent maintenance", well maybe... [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
CR450F Top End Update
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