Honda TRX450R 04-05 500cc Big Bore Kit


Honda TRX450R 04-05 500cc Big Bore Kit

SKU: bbk_500 Category:


500 Big Bore Kit,
Includes Piston kit, Sleeve & Top End Gasket kit


  • Honda TRX 450R, 2004-2005

Item Description & Information

  • Expect Gain of 4-6 HP with this Kit!

Kit Includes:

  • JE Piston Kit:
    • 12:1 Compression Piston, 99mm +5mm
    • Rings
    • Circlips
    • Wrist Pin
  • 99mm Sleeve
  • Cometic Top End Gasket Set

This kit requires that your Stock Cylinder be Resleeved, Finish Bored and Honed. We offer that service for $195, or your local machine shop can do the work for you. This kit also requires that your engine cases be machined in order to make room for the new sleeve. If you’re interested in having us do the machine work, please contact us. You’ll need to send us your cylinder and bare engine cases.


The compression ratio of this piston is 12:1. We recommend that you run 105 octane minimum for optimal engine life. Higher octane fuel burns cleaner and improves engine life — and ultimately it’s a lot cheaper than having to rebuild your top end!!

Additional information

Weight 5 lbs
Dimensions 10 x 10 x 10 in