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Do I have to replace both pistons if only one is bad?
 

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i dont believe so but mine as well start fresh on both so theres no chance of the other one goin bad under normal riding conditions
 

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normal driving conditions dont break shit. the guy with the wallet can do what he wants but he really dosent have to. the other cylinder lives in a totally different enviroment and it will be just fine left alone![^]
 

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easy ther blewbyyou we all have are own opions and theres no need to got crazy on me. alright your new here so i am not gonna tell the mod just that we on snowmobile fanatics dont bash brands or others opions alright
 

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AHH!! lots of testosterone(SP!) here....

To answer the question, if the other piston has good compression, its fine...
 

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If only one piston is bad, you don't need to replace the other. However, you may as well throw a new set of rings on the old piston, then your compression will be like new on both cylinders.
 

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I agree you don't have to replace the piston, the rings are a great suggestion. First thing I would do though is find out what destroyed the old piston if you already haven't.
 

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Yup, I agree that if the piston is ok, leave it, but I'd at least replace the rings. This will help balance the compression between the cylinders.
 

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What's wrong with putting new rings on an old piston? I see no problems with this. Of course you have to make sure you deglaze the cylinder first........I mean come on, thats a given.
 
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