Same-day shipping cutoff: Noon Pacific Time

We will be leaving the office slightly earlier than usual this Friday 5/24 at 2pm (Pacific Time) and will be back in action on Tuesday 5/28 at 9:30am. We are taking a little break to enjoy some quality time with our families and to celebrate the Memorial Day weekend.

Search Products

Category
Model
Year

Big Bore Kit - 440cc, Athena

CARB   WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
DRZ400 '00 - '25 DRZ400S '00 - '25 DRZ400E '00 - '25 DRZ400SM '05 - '25
  • Includes aluminum cylinder, piston kit, and special gasket set designed for larger water jackets
  • Bolts on with no machining required
  • 94mm big bore piston
  • Aluminum cylinder designed with wider water jackets for better cooling.
  • Forged hi-compression piston  12.8:1
  • Includes all necessary Rings, Clips, and Gaskets.
Ships in 3-5 business days
$937.95

Big Bore Kit - 434cc, Cylinder Works

CARB   WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
DRZ400 '00 - '03 DRZ400S '01 - '25 DRZ400SM '05 - '25 DRZ400E '00 - '07
  • Direct bolt-on, ready-to-install cylinder; requires no replating and looks virtually identical to the OEM
  • Nickel Silicon Carbide plated for long life
  • Honed to exact size for easy piston installation
  • Big bore cylinders do not require any machine work
  • Come complete with gaskets, cylinder, 94mm piston, rings, pin and clips
Ships in 3-5 business days
$700.95

Big Bore Kit - Stroker 462cc

CARB   WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
DRZ400 '00 - '03 DRZ400S '00 - '25 DRZ400SM '05 - '25 DRZ400E '00 - '07

All in one package.

  • Hot Rods complete +4mm stroker crank assembly
  • 94mm big bore cylinder and piston kit
  • Complete gasket set with seals
  • Includes new crank bearings

We suggest adding a set of HotCams camshafts and a new clutch kit for the best results.

Ships in 3-5 business days
$1,099.00