The Hot Rods 4173 Stroker Crankshaft is a performance-focused replacement for select Yamaha YFZ450 models. Designed as a premier alternative to a costly OEM crankshaft, this complete assembly is ready for installation and includes proven Hot Rods connecting rods, top-end bearings, and crankshaft webs. It is factory assembled and trued to OEM specifications for dependable fit, performance, and durability.
Engineered for increased stroke, the Hot Rods 4173 crankshaft can increase engine displacement and horsepower while providing a convenient drop-in replacement in most applications. CNC machining and dynamic balancing support smooth operation with the added stroke, and the crankshaft is designed to use the stock piston in most applications. It can also be matched with a Cylinder Works Big Bore cylinder for additional displacement and power gains.
Feature: Complete stroker crankshaft assembly ready for installation
Feature: Increased stroke for greater displacement and horsepower potential
Feature: Factory assembled and trued to OEM specifications
Feature: CNC machined and dynamically balanced for the increased stroke
Feature: Uses the stock piston in most applications
Feature: Fully rebuildable with genuine Hot Rods connecting rods and bearings
Feature: Gears manufactured to DIN Class 9 or higher quality standards
The Hot Rods manufacturer part number and vendor part number are both 4173. This crankshaft fits 2004–2009, 2012–2013 Yamaha YFZ450 models, including 2007–2008 Yamaha YFZ450 SE editions. Verify the model year and engine configuration before ordering.
Features:
- Complete Hot Rods stroker crankshaft assembly with connecting rods, top-end bearings, and crankshaft webs
- Increased stroke supports greater engine displacement and horsepower
- Drop-in replacement design requiring no modification in most applications
- CNC machined and dynamically balanced for reliable performance
- Uses the stock piston in most applications
- Fully rebuildable with genuine Hot Rods connecting rods and bearings
- Gears manufactured to DIN Class 9 or higher quality standards
- Fits select 2004–2009 and 2012–2013 Yamaha YFZ450 models, including 2007–2008 YFZ450 SE
Fitment:
2004 Yamaha YFZ450
2005 Yamaha YFZ450
2006 Yamaha YFZ450
2006 Yamaha YFZ450 Bill Balance Edition
2007 Yamaha YFZ450
2007 Yamaha YFZ450 Bill Balance Edition
2007 Yamaha YFZ450 SE
2008 Yamaha YFZ450
2008 Yamaha YFZ450 SE
2009 Yamaha YFZ450
2012 Yamaha YFZ450
2013 Yamaha YFZ450