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Piston change on a Yamaha Xt 600 -88

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Having a question on above mentioned project. Found out that the piston on the bike is starting to wear, and rattles a bit so might be a good idea to get it changed and rebored in the near future.

After looking around i found that the pricing for a original or high compression piston do not differ to much.

Question is, can the old machine handle it ?

The xt engine is known to be reliable, how much will this change ?

Wear and tear ?

Bearings to be changed ?

Grateful for whatever input u might have on this

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There is no way to know the internal condition of the engine without a teardown and an examination by a meachanic who knows how to gage wear from measurements and experience. Even if the bottom end is sound, the valves and guides may be worn out. Probably time for a cam chain too. Usually the valve gear lives pretty long on Japanese bikes, but still needs to be looked at.

The compression ratio of the piston will determine if it is a good bet for a bike with stock cams, and wether or not you need to run race gas. If you work closely with an experinced motorcycle mechanic, he can help with this decision. Based on the fact that you didn't include important data on the high comp piston, I would not expect you to be an experinced engine builder and therefore you would be well advised not to go inside the motor without help.

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