GYTR High Compression Piston

YFZ450 Application:

• Increases engine compression ratio to 13.0:1 (stock 2006-2009 is 11.2:1 and 2004-&2005 is 11.9:1).
• Offers 1.5 to 3 horsepower increase throughout most of the power band.
• No crank rebalancing necessary.
• Piston is forged aluminum with machined valve pockets for additional valve clearance when higher lift camshafts are used.
• Includes piston rings, piston pin, and clips (uses stock replacements).
• NOTES: GYTR® Top End Gasket Kit is required for installation (sold separately). Installation will require use of minimum 100-octane racing fuel.

YFZ450R Application:

• Increase engine compression ratio to 13.2:1 (stock is 11.4:1).
• Offers 1.5 to 3 horsepower increase throughout most of the power band.
• No crankshaft rebalancing necessary.
• Piston is forged aluminum with machined valve pockets for additional valve clearance when higher lift camshafts are used.
• Includes piston rings, piston pin, and clips (uses stock replacements).
• NOTES: Uses stock gaskets (not included). Installation will require use of a minimum 100-octane racing fuel.

Legal Note: This accessory may be restricted to closed-course use. This performance accessory does not meet California standards for off-road recreational vehicle usage regardless of model year.