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yz450f

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i currently own a yamaha yz450f 2012 and it is throwing smoke like a 2 stroke. I think that's a valve issue or valve seal. 

 

I am worried because of  4 stroke maintenance price, and I want to buy a lighter bike. 

 

I want to buy a ktm sx250 2 stroke, but I want to know if those bikes are actually worth it or wait for a better yz450f. 

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i currently own a yamaha yz450f 2012 and it is throwing smoke like a 2 stroke. I think that's a valve issue or valve seal.

I am worried because of 4 stroke maintenance price, and I want to buy a lighter bike.

I want to buy a ktm sx250 2 stroke, but I want to know if those bikes are actually worth it or wait for a better yz450f.

Definitely sounds like it needs rings. I don't think valves can make a bike smoke? I'm not completely sure. But it definitely could use a set of rings and a piston.

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