These are the parts i use to rebuild my Yamaha YBR 125 engines with
Firstly you need good gasket sets i always use thes NE brand ones never failed me yet
I use either SKF or Koyo bearings
Athena Seals New oil seals need to be fitted on every rebuild                                                                           
Ive had very good success with these piston from firefox but if you can find genuine on an auction then but them
 first.
For barrels i always try to rebore and oversize piston.





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