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PERFORMANCE PARTS
911  HEADSTRONG  5-PORT BIG BORE
911 BIG BORE 5 PORT HEADSTRONG UPGRADE
911 POCKET BIKE PARTS
COMPETITION MOTORS
POCKETS & CUSTOMS
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POLINI 911 BIG BORE HEADSTRONG
PERFORMANCE PACKAGE

BRINGS YOUR CURRENT BORE FROM 39cc TO 50cc FOR ENORMOUS  
POWER GAINS IN ALL RPM RANGES.

KIT INCLUDES:

  •  5 PORT BIG BORE CYLINDER
  •  BIG BORE  39.6MM PISTON SET WITH WRIST PIN, BEARING AND CIRCLIPS
  •     (STOCK PISTION IS 34.5MM)
  •  MACHINE SHAVED PISTON RING FOR ADDED RPM'S
  •  PBU'S EXCLUSIVE BRONZE 16.5 TO 1 RACE DOME
  •  INNER COOLING BILLET HEAD WITH BRASS OUTLET
  •  0.20" AND 0.30" BASE GASKETS FOR  PROPER SQUISH ADJUSTMENT
  •  PBU DESIGNED HEAD GASKET WITH RESTRICTION WATER JACKETS
  •  NGK RACING HOT PLUG
  •  MOTOR MOUNT AND ALL NECESSARY HARDWARE AND GASKETS.
  •  COMPLETE INSTRUCTIONS

$346.00 Complete kit
20mm MIKUNI
CARB/ BILLET REED
PACKAGE