520 Bolt-on Topend Kit for 420/500

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  • Regular price $775.00
  • 2 available


*Made to order. Email us for ETA.

This is a 420/500 to 520(518cc) conversion topend kit with standard size piston, rings, pin, clips, cylinder and gaskets. This 520 cylinder will fit 420 and 2012+ 500 cases without any case cutting. These are all OE Honda parts in the Honda packaging. We strongly recommend a fuel tuner to correct the air/fuel ratio on the 420 and 500.

**No warranty expressed or implied due to the nature of this product.