Honda Big Bore Service
Our prices below includes cylinder sleeve installed, Top End kit and all necessary modifications ( bore, port, powervalve machined, head re-chamfer to work with larger piston)

If you need to increase displacement then increasing the bore size is the best option. You cannot go wrong with an ACAS works Big Bore kit. ours is quite reliable and the most reasonable on the market today.. 

The process is a simple as follows. 

  • Remove your jug

  • Remove the studs and all other items not needed for the Mod ( we charge extra for this removal)
  • leave the powervalve in,
  • Send the cylinder head
  • Fill out the Job Order form completely and put it in the box
  • If you do not see your cylinder model in the drop down, then write it in the notes
  • Pack your jug properly to avoid damage during shipping
2 Stroke Honda Big Bore ( this will include a Wiseco, Namura or Prox Top End kit)
CR80   82.9cc    bore  49mm          1986 -02       $300
CR80   102cc     bore  52 mm          1986 -02       $375
CR85   84.7cc    bore 49.5 mm        2003 -04       $375
CR85   102cc     bore  52mm           2003 -04       $375
CR125  134cc      bore  56mm          1996 -00       $400