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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Tell Me Your Horror Stories of MX 4 Stroke Engines
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[QUOTE="oldfrt613, post: 1057214, member: 62011"] I have both and work on both. The thumper does take longer to do most any maintenance than the 2 stroke ( except mix gas, that's faster on the thumper ). The thumper really isn't that much more complicated than the 2 stroke when you throw in the power valves on the 2 strokes. There is less working room on the thumper. I can't even change a carb jet on it without taking the subframe off. I run an hour meter on the thumper and am religious about watching the valve train. I have had no real issues with the thumpers. Some of my buddies have had major failures, but these are the same guys who seem to guage when to change the air filter by the thickness of the dirt accumilated. They basically ride until it quits. My take is that the thumpers are less tolerant of poor maintenance than the 2 srokes. And as a mechanic, you know what kind of things happen with valve train failures. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Tell Me Your Horror Stories of MX 4 Stroke Engines
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