YZ491F Stealth Big Bore/Stroker

Please call to order 608-842-0680 Availability: In stock. $999.00   Quick Overview YZ491F STEALTH Specifications:Fits 2003-2009 YZ450F   Choose option: We modify your cylinder Installed and Blueprinted: $ 500.00   Product Description Bore: Yes Stroke: Yes Actual Displacement =...

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YZ488F Ice Cube Big Bore

Please call to order 608-842-0680 Availability: In stock Regular Price: $1,249.00 Special Price: $895.00   Quick Overview YZ488F Ice Cube Specifications:Fits 2003-2009 YZ/WR 450F   Choose option: “Bolt on” – Includes cylinder Installed and Blueprinted: $ 300.00   Product...

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YZ488F Stealth Big Bore

Please call to order 608-842-0680 Availability: In stock. $950.00   Quick Overview YZ488F STEALTH Specifications: Fits 2003-2009 YZ/WR 450F   Choose option: We modify your cylinder Installed and Blueprinted: $ 300.00   Product Description Bore: Yes Stroke: No Actual Displacement...

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YZ478F Stealth Big Bore – Max Power Built

Please call to order 608-842-0680 Availability: In stock. Regular Price: $580.00 Special Price: $499.00   Quick Overview YZ478F STEALTH Specifications:Fits 2003-2009 YZ450F & WR450F   Choose option: (03-05) “Bolt on” – Includes cylinder: $ 125.00 (06-08) “Bolt on” –...

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YZ468F Stealth Big Bore

Please call to order 608-842-0680 Availability: In stock. $599.00   Quick Overview YZ468F STEALTH Specifications: Fits 2003-Current YZ/WR 450F   Choose option: We modify your cylinder Exchange cylinder: $ 75.00 “Bolt on” – Includes cylinder: $ 300.00 Installed and Blueprinted:...

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YZ/WR445F Stealth Big Bore

Please call to order 608-842-0680 Availability: In stock. $589.00   Quick Overview YZ/WR445F STEALTH Specifications: Fits 2000-2002 YZ/WR426F   Choose option: We modify your cylinder Exchange cylinder: $ 75.00 “Bolt on” – Includes cylinder: $ 503.00 Installed and Blueprinted: $...

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YZF / WR 300cc Yamaha Big Bore / Long Rod Stroker YZ250F WR250F

Please call to order 608-842-0680 Availability: Built to order Regular Price: $2,495 Special Price: $1,950   Product Description For: 2001-2013 YZ / WR 250F Includes: Cylinder: Install longer forged Aluminum sleeve, and plate with Ceramic Nickel Bore coating.  Copper fire...

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YZ 292F Stealth big bore and stroker

Please call to order 608-842-0680 Regular Price: $1,595 Special Price: $1,375.00   Quick Overview Fits 2003-2013 YZ250F   Product Description Includes: Modify OEM Cylinder with forged aluminum liner. Plated with Ceramic Nickel Bore coating. Copper fire ring installed around combustion...

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YZ/WR 276F Stealth big bore

Please call to order 608-842-0680 Regular Price: $1,095.00 Special Price: $895.00   Quick Overview Fits 2001-2013 YZ250F and WR250F   Product Description Includes: Cylinder Modifications: OEM Cylinder with forged aluminum liner installed. Plated with Ceramic Nickel Bore coating.  Copper fire...

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YZ277F Stealth Big Bore/Stroker

Please call to order 608-842-0680 Regular Price: $1470 Special Price: $1249   Quick Overview Applications: 2003 – 2013 YZ250F 2008-2013 WR250F   Product Description Includes: OEM 2001-2001 cylinder bored and plated with Ceramic Nickel Bore coating Fuel Required: 91-110...

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YZ/WR 276F Ice Cube Big Bore

Please call to order 608-842-0680 Regular Price: $1,249.00 Special Price: $895.00   Quick Overview YZ/WR 276F ICE CUBE Specifications:Fits 2001 – 2013 YZ/WR 250F   Product Description Actual Displacement = 276.20cc Includes: Standard height Ice Cube cylinder CP Piston...

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YZ/WR 270F Stealth Big Bore

Please call to order 608-842-0680 Regular Price: $699.95 Special Price: $595   Quick Overview YZ/WR270 Specifications:Fits 2001 – 2013 YZ/WR250   Product Description Cylinder Works Cast cylinder with Vertex piston kit and gaskets. Actual Displacement = 269cc Compression...

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YZ/WR 262F Stealth Big Bore

Please call to order 608-842-0680 Regular Price: $599 Special Price: $495   Quick Overview YZ/WR262F STEALTH Specification: Fits 2001 – 2013 YZ/WR250F   Product Description Bore: Yes Stroke: No Actual Displacement = 262.73cc Engine Modifications Included: Cylinder: OEM Cylinder bored...

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YZ280 Big Bore/Stroker

Please call to order 608-842-0680 Special Price: $1,795.00   Max Power YZ280 Big bore stroker engine build. Fits 1999-Current YZ250   Product Description This is the big bore and stroker build that we offer for the 1999-Current YZ250. 280cc is...

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YZ 285 Big Bore

Please call to order 608-842-0680 Special Price: $599 Max Power YZ285 Fits 1999-Current Yamaha YZ250   Product Description Actual Displacement = 285.06cc Engine Modifications Required: Cylinder: Bore, Port and Plate. Power Valves: Precision machined to match big bore cylinder. Head:...

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YZ 265 Big Bore

Please call to order 608-842-0680 Special Price: $599   The Max Power YZ265 Fits 1999-Current YZ250   Product Description Actual Displacement = 265.34cc Engine Modifications Included: Cylinder: Bore, Port and Plate. Power Valves: Precision machined to match big bore...

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YZ167 Big Bore/Stroker

Please call to order 608-842-0680 Availability: In stock. Regular Price: $2,050.00 Special Price: $1,750.00   Quick Overview YZ167 Specifications: Fits 1997-Current YZ125   Product Description Bore: Yes Stroke: Yes Actual Displacement = 166.82cc Engine Modifications Required: Cylinder: Bore, Port and...

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YZ144 Big Bore/Stroker

Please call to order 608-842-0680 Availability: In stock. $1,125.00   Quick Overview YZ144 Specifications: Fits 2005-Current YZ125 Call for bolt-on pricing   Choose option: Exchange your cylinder: $ 74.00 Installed and Blueprinted: $ 450.00 We modify your cylinder   Product...

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YZ139 Big Bore

Please call to order 608-842-0680 Special Price: $549   Quick Overview YZ139 Fits 1997-Current YZ125   Product Description Actual Displacement = 139.07cc Engine Modifications Included: Cylinder: Bore, Port and Plate. Power Valves: Precision machined to clear piston. Head: Re-chamber to...

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YZ134 Big Bore

Please call to order 608-842-0680 Special Price: $549   Quick Overview YZ134 Specifications:Fits 1997-Current YZ125 Product Description Actual Displacement = 134.23cc Engine Modifications Included: Cylinder: Bore, Port and Plate. Power Valves: Precision machined to match big bore ports. Head:...

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