OEM 61X 771cc Top End Kit


Transform your OEM 61x cylinder from an ordinary 701cc into a 771cc arm yanker!

Our 85mm Big Bore is where the real fun begins. Utilizing the stock crank means this is about as low maintenance as you can get. Great for surf and amateur class legal boats. We provide tuning recommendations and support to ensure complete satisfaction with our top end long after delivery.

BB771 Top End Kit Includes:

  • OEM 61x Sleeve Removal
  • Big Bore Sleeve Installation (84mm to 86mm bore)
  • XScream Freestyle Cylinder Porting
  • Cylinder Decking
  • ProX or Wiseco Piston Kits (add $70.00 for Wiseco Forged Pistons)
  • Wrist Pin Bearings
  • Domes for pump, aviation or race fuel
  • Cut Base Gasket

BB771 Piston Options:
84mm, 84.5mm, 85mm, 85.5mm and 86mm from ProX and Wiseco

  • 84mm bore = 753cc
  • 85mm bore = 771cc
  • 86mm bore = 790cc

- Customer provides OEM 61x cylinder
- OEM 62T cases will need to be fly cut to accept BB sleeves
* Upgrade to Wiseco Forged Piston Kits for $70.00

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  • Manufactured by: X-Metal

This product was added to our catalog on Friday 25 May, 2012.

Copyright © 2018 Team X Scream.