This auction is for an original Bultaco spare-part, the piston rings set, at the standard size, of the model Frontera 125 cc, Streaker 125, serial numbers 186M and 204M. It serve a lot of other Bultaco models of 125 cc, with bore 54,2 mm and stroke 54 mm, like Pursang MK10 125, serial number 194M. Check it please with the Bultaco's Ref: 186.10-041. The situation of these items is New Old Stock. 

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