Yamaha YFM 660 F Grizzly 4x4 Stroker Crankshaft - Hot Rods - `02-`08 is a complete stroker crankshaft assembly for the 2002–2008 YFM660F Grizzly 4x4. Built by Hot Rods and supplied factory assembled, it’s intended to increase displacement and improve torque delivery while being ready for installation.

This crankshaft is factory assembled, trued and balanced to OEM specifications and ships complete with Hot Rods connecting rods, top end bearings and crankshaft webs. Most applications do not require case or piston modifications and the unit can be used with stock pistons unless noted. The design targets stronger midrange torque and more usable power for trail and utility use, while using high-quality DIN Class 9 or higher materials for durability when installed correctly.

Features

• Direct fit for 2002–2008 Yamaha YFM660F Grizzly 4x4
• Factory assembled, trued and balanced to OEM specs
• Includes Hot Rods connecting rods, top end bearings and crank webs
• Increases displacement, torque and horsepower potential
• High-quality DIN Class 9 or higher components; minimal modifications required in most cases

If you have questions or need fitment guidance, call us directly — we’re happy to help. We have two locations offering installation and customization services: Austin, Texas and the Los Angeles, California area. Call (512) 982-9393 for TX or (562) 981-6800 for CA to speak with a technician or schedule service.

If you’re considering purchasing multiple items, please contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov