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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YZ90 (National Engine) Stroker

Please call to order 608-842-0680 Availability: In stock. Regular Price: $1,725.00 Special Price: $1,475.00   Quick Overview YZ90 Stroker Specifications: Fits 2001-2008 YZ80 and YZ85   Choose option: Send us your engine and get a 90cc stroker kit instead Spare...

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YZ112 Big Bore/Stroker

Please call to order 608-842-0680 Availability: In stock. Regular Price: $1,975.00 Special Price: $1,675.00   Quick Overview YZ112 Specifications: Fits 2001 – Current YZ80 and YZ85 Send us your engine and get a 105cc stroker kit installed.   Product...

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YZ105 Big Bore/Stroker

Please call to order 608-842-0680 Regular Price: $1,875.00 Special Price: $1,575.00   Quick Overview YZ105 Specifications: Fits 2001 – Current YZ80 and YZ85 Send us your engine and get a 105cc stroker kit installed.   Product Description Bore: Yes Stroke:...

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YZ103.5 Big Bore

Please call to order 608-842-0680 Regular Price: $900.00 Special Price: $549   Quick Overview fits 2002-2014 YZ85 Product Description Actual Displacement = 103.48cc Engine Modifications Included: Cylinder: Bore, Port and Plate. Head: Re-chamber to work with the Big Bore piston....

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YZ98 Big Bore

Please call to order 608-842-0680 Special Price: $499   Quick Overview YZ98 Big Bore Specifications:Fits 2001-Current YZ80 and YZ85 Product Description Engine Modifications Included: Cylinder: Bore, Port and Plate. Head:  Re-chamber to work with the Big Bore piston. 100...

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YZ92 Big Bore

Please call to order 608-842-0680 Be the first to review this product Availability: In stock. Regular Price: $725.00 Special Price: $499   Quick Overview YZ92 Big Bore Specifications:Fits 2001-Current YZ80 and YZ85   Product Description Actual Displacement =...

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