Note: This is a specialty product and is not currently available for purchase online. Please call Duncan Racing International and a DRI staff member will assist you by collecting the required specifications and placing your order. Thank you.

Product Information:

Big Bore Kit
Kit Includes:Piston and Head gasket

('04-'05)
470cc (12-1) $295.00
470cc (13.5-1) $295.00
478cc (12-1) $295.00

('06-'16)
470cc (12.5-1) $295.00
478cc (12.5-1) $295.00
470cc (13.0-1) $295.00

*NOTE: Cylinder must be stripped, bored and re-nikasil’d at an additional cost

Replacement Head Gasket

#BB-12251-96 470CC '04-'05 $49.95
#BB-12256-98 470CC '06-'10 $49.95
#BB-12256-99 478CC '06-'10 $49.95

DRI strongly recommends 470cc big bore kits for most applications. The 470cc kits offer the best balance of performance, reliability and value. Note: Call for details regarding larger displacement big bore kit options.