Bottom End

Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller spaceNo extra gaskets or leaking plastic spacers Yamaha -- YZ 250 -- (2014, 2009, 2012, 2004, 2015, 2008, 2010, 2013, 2007, 2005, 2011, 2003, 2006,...

Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller spaceNo extra gaskets or leaking plastic spacers Yamaha -- YZ 250 -- (2005, 2011, 2008, 2007, 2003, 2006, 2004, 2015, 2009, 2012, 2010, 2013, 2014,...

Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller spaceNo extra gaskets or leaking plastic spacers Yamaha -- YZ 250 -- (2004, 2015, 2010, 2013, 2014, 2005, 2011, 2008, 2009, 2012, 2007, 2003, 2006,...

Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller spaceNo extra gaskets or leaking plastic spacers Kawasaki -- KX 250 -- (2005, 2007, 2004, 2003, 2008, 2006)

Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller spaceNo extra gaskets or leaking plastic spacers Honda -- CRF450R -- (2006, 2007, 2004, 2008, 2005)

Machined from 303 stainless steel that's 15% heavier than standard steel, allowing more mass in a smaller spaceNo extra gaskets or leaking plastic spacers Honda -- CR250R -- (2006, 2007, 2005, 2004, 2003)

Replacement Twin Cam "A" engine cases for stock H-D chassis only (carb and EFI)Feature greater overall strength than stock crankcasesStrong, dependable Timken?-style sprocket shaft bearingsClearanced for strokes up to and including 5"All passages between...

Replacement Twin Cam "A" engine cases for stock H-D chassis only (carb and EFI)Feature greater overall strength than stock crankcasesStrong, dependable Timken?-style sprocket shaft bearingsClearanced for strokes up to and including 5"All passages between...

Designed to add even more torque to your big bore M8, for those that keep the revs below 6000 rpmKits include all required bearings, o-rings, and hardwareGear drive cams provide improved valve timing accuracyGear drive kits include drive gearsMade in the...

Designed to add even more torque to your big bore M8, for those that keep the revs below 6000 rpmKits include all required bearings, o-rings, and hardwareGear drive cams provide improved valve timing accuracyGear drive kits include drive gearsMade in the...

Big Bore Kit:Bolt on kit. No case machining required4.250" boreForged pistons11.1: compression ratioOil Pump/Cam PlatePrecision machined from billet aluminumPassage plugs removable for servicingIndependent scavenge sections for flywheel cavity and cam...

Big Bore Kit:Bolt on kit. No case machining required4.250" boreForged pistons11.1: compression ratioOil Pump/Cam PlatePrecision machined from billet aluminumPassage plugs removable for servicingIndependent scavenge sections for flywheel cavity and cam...