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The TTR250 FAQ web pages -> TTR250 -> Wanted adverts -> piston to bore clearance
Post Info TOPIC: piston to bore clearance
gaz googe


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piston to bore clearance
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hi, im buying a new piston 73.95mm, Question is what size do i rebore my cylinder to? 

 

cheers

 

Gaz



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TTRfan


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The clearance is about 0.05mm but what you should be doing is giving your new piston to the engineer and he will bore to the correct size for it.

Brian



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gaz googe


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Cheers Bri, Its my brother who's doing it and hes a mechanic. Ill be ordering the piston kit soon, what i do need is valve stem seals

 

cheers

 

Gaz



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TTRfan


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gaz googe wrote:

Cheers Bri, Its my brother who's doing it and he's a mechanic. Ill be ordering the piston kit soon, what i do need is valve stem seals

Sounds like you are in safe hands Gary biggrin

We can supply the genuine Yamaha valve stem oil seals from stock if your bro' can't source them - £22 for the four. Also gasket sets - see here

 



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