Upgrade your engine with the Hot Rods 4180 Stroker Crankshaft, a performance-focused replacement designed for select Yamaha 660 applications. This complete crankshaft assembly is factory assembled and trued to OEM specifications, providing a dependable alternative to a costly original-equipment crankshaft. It includes proven Hot Rods connecting rods, top-end bearings, and crankshaft webs for a ready-to-install solution.
The Hot Rods 4180 features increased stroke to help produce greater engine displacement and horsepower while serving as a drop-in replacement in most applications without modification. The crankshaft is CNC machined and dynamically balanced to accommodate the increased stroke, and it is designed to use the stock piston in most applications. It may also be matched with Cylinder Works Big Bore cylinders for additional displacement and performance gains.
Built for durability, the Hot Rods 4180 uses gears manufactured to DIN Class 9 or higher quality standards. The assembly is fully rebuildable with genuine Hot Rods connecting rods and bearings, helping simplify future service and extend engine life. This manufacturer part number 4180, also identified by vendor part number 421-4180, fits 2002–2008 Yamaha YFM660FG Grizzly 4WD with IRS and 2004–2006 Yamaha YXR660F Rhino 660 models. Verify year, model, and engine configuration before installation.
Features:
- Complete Hot Rods stroker crankshaft assembly ready for installation
- Manufacturer: Hot Rods
- Manufacturer part number: 4180
- Vendor part number: 421-4180
- Increased stroke supports greater displacement and horsepower
- Drop-in replacement requiring no modification in most applications
- Factory assembled and trued to OEM specifications
- CNC machined and dynamically balanced for the increased stroke
- Designed to use the stock piston in most applications
- Includes Hot Rods connecting rods, top-end bearings, and crankshaft webs
- Fully rebuildable with genuine Hot Rods connecting rods and bearings
- Gears manufactured to DIN Class 9 or higher quality standards
- Fitment: 2002–2008 Yamaha YFM660FG Grizzly 4WD with IRS
- Fitment: 2004–2006 Yamaha YXR660F Rhino 660
Fitment:
2002 Yamaha YFM660FG Grizzly 4WD [IRS]
2003 Yamaha YFM660FG Grizzly 4WD [IRS]
2004 Yamaha YFM660FG Grizzly 4WD [IRS]
2004 Yamaha YXR660F Rhino 660
2005 Yamaha YFM660FG Grizzly 4WD [IRS]
2005 Yamaha YXR660F Rhino 660
2006 Yamaha YFM660FG Grizzly 4WD [IRS]
2006 Yamaha YXR660F Rhino 660
2007 Yamaha YFM660FG Grizzly 4WD [IRS]
2007 Yamaha YXR660F Rhino 660
2008 Yamaha YFM660FG Grizzly 4WD [IRS]