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Dirt Bike Brands - Other
pistons for 250f...
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[QUOTE="yz250-effer, post: 135660, member: 20448"] [b]I would have to agree a little bit.[/b] I got a 4 stroke so I would not have to do top ends all the time. Personally, I have not seen any evidence that the 250F is more fragile than the 426 - and the success of the 426 is why I got the 250F in the first place. I guess the real question ( and time will tell ), is how long does a 250F piston last with x amount of hours? Assuming the oil and filter are well maintained, of course. Heck, I put 50-60 hours on my 98 kx250 with no loss of compression. I would think a 4 stroke piston would last at least twice as long as a 2 stroke piston. Even at higher rpm and compression. Mine has 70 -75 non-racing hours on it so far, I think. I plan on a tear down around it's 1 year anniversary to check specs. The yamaha manual does not give an piston/ring replacement hour guideline that I could find. Just " as required". What does that mean? I know we are not talking about an xr here, but the 250F still gets great 4 stroke lubrication that a 2 stroke does not. Kind of a tootsie roll pop quesion. How many bites to the center? How many "normal" hours will the 250F piston last? [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
pistons for 250f...
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