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Yamaha MX & Off-Road Dirt Bikes
How much maintenance are 4-strokes?
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[QUOTE="Ol'89r, post: 1299004, member: 17212"] Excellent point Doug. Groundeffect's bike is a completely different animal than the current crop of mx bikes on the market. The new mx bikes are not much more than a single cylinder F-1 engine. They use titanium coated valves, short skirted pistons that run in a coated bore, sometimes only two piston rings and a very short stroke which allows the engine to rev to over 13,000 rpm. They are a full-on race engine and due to their design their life expectancy is rather short. Especially if they are not maintained. The TT-R's and XR's use a long skirt piston in a cast iron bore (not sure about the TT-R) and usually use three piston rings. They run a much lower rpm range and the cams are designed more for torque than high revving hp. They have a longer stroke with a smaller diameter piston that also keeps the rpm's down. The valves are steel and can be re-ground when they wear and the valve springs last much longer since the engine doesn't rev as high. They have larger, stronger engine cases and hold more oil. All of this equates to a longer lasting engine with less maintainance problems. Of course it also equates to less hp. It's up to the individual to decide what you are going to do with your bike and then pick the best weapon. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
How much maintenance are 4-strokes?
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