SS900 Stock Stroke 900cc Engine Short Block


Our SS900 Short Block uses an XScream billet power valve 7 port cylinder with the OEM Yamaha 701 crank. This SS900 power valve cylinder has unmatched reliability and linear power delivery for the enthusiast that demands the best. We provide tuning recommendations and support to ensure complete satisfaction with our engine long after delivery.
The SS900 is also available as top end kit for use with 62T cases.

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

SS900 Short Block Features:

  • XScream Freestyle Cylinder Porting
  • Modified Yamaha 62T cases - Includes XScream epoxy and finger port work, reinforcing front seal area with epoxy, installing a second pulse line fitting and CNC work to match the top case to larger transfer ports on our billet power valve cylinder.
  • XScream Custom Sleeves (90mm to 91mm bore)
  • Wiseco Forged Pistons
  • Custom cut domes for pump, aviation or race fuel
  • OEM Yamaha 701 Crankshaft
  • OEM Yamaha Crank Seals

SS900 Piston Options:
90mm, 90.5mm and 91mm

  • Custom Wiseco Flat Top Pistons
  • 90mm bore = 865cc
  • 90.5mm bore = 875cc
  • 91mm bore = 885cc

- XScream Short Blocks require a Boyesen RAD Valve intake or Riva Reed Spacer.
- Custom engraving and colors available, contact us for more information.

This was the engine Derrick Kemnitz Jr won the 2011 Amateur World Finals with.

*The SS865 is now the SS900

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  • Manufactured by: X-Metal

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

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