XS 1000 Billet Top End Kit

The legendary XS 1000 billet power valve 7 port cylinder delivers extreme power with unmatched reliability for the enthusiast that demands the best. This top end requires a +10mm Yamaha Stroker Crank. We provide tuning recommendations and support to ensure complete satisfaction with our top end long after delivery.

XScream Power Valves:

• The most innovative valve design available
• Lower profile means they clear Factory B pipe without modification to the head pipe.
• No spacer required.
• Less expensive and more reliable than any other power valves

XS1000 Top End Kit includes:

• XS1000 Billet Cylinder with Power Valves
• XScream Freestyle Cylinder Porting
• Wiseco Forged Piston Kits
• Wrist Pin Bearings
• XScream XS1000 Head
• XScream Custom Sleeves Installed (90mm to 91mm bore)
• Domes cut for pump, aviation or race fuel
• Dome O Rings
• Custom Base Gasket
• Stainless Steel Bolts for Cylinder and Head

XS1000 Piston Options:
90mm, 90.5mm and 91mm Custom Wiseco Flat Top Pistons

• 90mm bore = 992cc
• 91mm bore = 1014cc

- We recommend using our custom +10mm Stroker Crankshaft with OEM Yamaha bearings
- We highly recommend our 62T case modifications to extract maximum power from this top end kit. Modifications include XScream epoxy and finger port work, reinforcing front seal area with epoxy, installing a second pulse line fitting, CNC work to match the top case to larger transfer ports on our billet power valve cylinder, installation of "Disaster" plate and boring the cases to accept a stroker crank.
- Custom engraving and colors available, contact us for more information.