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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Two stroke VS four stroke. Facts & figures.
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[QUOTE="truespode, post: 892118, member: 29329"] From what I am realizing the top end on a 250F is not that difficult. I believe it takes longer than a 2t but not considerably. As to the costs associated for maintenance... on a spode scale the 2t is much less expensive. When I had a 2t I change the piston twice a year (a little over 30 hours per top end). A little over a hundred bucks each time. With the 4t I replace the piston once a year (a little over 60 hours). $180 or so for the parts if I do not get a timing chain which I believe should be replaced once a year at least. The valves can be an issue to but I got over 60 hours on my stock CRF450 before I put in the SS valves and on my 2001 YZ250F I got 2 years of hard riding out of it and never touched the valves, neither did the kid who bought it from me. Add in the oil filters and the fact that I change the oil more frequently on the 4t the costs do go up. However, for me the costs are well worth it and not so much higher than 2t costs to make it unbearable. I prefer the engine performance of a 4t and the way it feels in the air. It gives me more confidence. Ivan [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Two stroke VS four stroke. Facts & figures.
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