YFZ 523 Stealth Big Bore/Stroker

Please call to order 608-842-0680


Quick Overview

YFZ 523 STEALTH Specifications:
Fits 2004-2008 YFZ 450


Choose Option:

“Bolt on” – Includes cylinder and crankshaft

Installed and Blueprinted: $ 500.00


Product Description

Bore: Yes

Stroke: Yes

Actual Displacement = 523.44cc


Engine Modifications Included:

Cylinder: OEM Cylinder with “Ice Cube Style” forged sleeve plated with Ceramic Nickel Bore coating

Fuel Required: 91 – 110 octane – Options Available

Piston/Crankshaft: Wiseco or CP Piston – Max Power Extreme Coated / OEM Crank Stroked and balanced

Head: No modification required

Crankcase: Balance Shaft mods required.


Same cylinder as the YFZ478 / 488 Stealth with the 523 Ice Cube crank. If you want nobody to know what you got and really want to smoke them then give it a try. We also recommend additional cooling upgrades for extreme applications. IE: Low speed, hot weather.

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