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pitster pro 125cc or 140cc ??

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Hi just came across a 2006 125cc pitster pro for a good price the guy told me it has a big bore kit on it my question is there anyway to tell without removing the head and measuring?? it has no stamp on the cylinder which i thought was odd had a 140cc and it was stamped..  i was able to measure the carb and it is a 26mm which is what would go with a 140cc 

any ideas thanks

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8 hours ago, nickwilliams79 said:

i ended up buying it it seems to have alittle more power than a 125cc

125cc or 140?? anyone know the 125cc stock cylinder measurements?

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That is a 146 cc big bore kit from tbparts.com. It's the 13mm wrist pin Jialing version with the 57mm bore. Ideally it should have a Lifan big bore head with it to have the compression ratio correct. This was the standard budget-race build 7 years ago and the TB logo on an aluminium cylinder is the key.

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