KPMI® valve springs are wound from Premium Kobe Super-Clean Chrome Silicon Wire. KPMI® valve springs are heat-treated, stress relieved, and shot peened to insure maximum performance and life. Springs are engineered for each specific application using proprietary advanced spring design simulation, and analysis software. Engineers pay special attention to cam and spring harmonics, stress, mass, and operating rpm.
Features:
- 80 Lbs of Seat Pressure / 205 Lbs @ 0.435" Lift (Max)
- Spring kit is designed for compatibility with the OEM integrated Seal/Base (OE# 3610212) where applicable
- Lightweight heat treated Steel Retainer and Beehive Spring reduce reciprocating mass while providing the spring forces required by high performance boosted racing applications.
Fits:
Yamaha_YFM350FG Grizzly 4WD [SRA] 2007 to 2014
Yamaha_YFM350FGI Grizzly 4WD [IRS] 2007 to 2012
Yamaha_YFM350FW Big Bear 4WD [SRA] 1987 to 1999
Yamaha_YFM350FX Wolverine 4WD [SRA] 1995 to 2005
Yamaha_YFM350G Grizzly 2WD [SRA] 2007 to 2012
Yamaha_YFM350R Raptor 2004 to 2013
Yamaha_YFM350U Big Bear 2WD [SRA] 1996 to 1999
Yamaha_YFM350X Warrior 1987 to 2004
Yamaha_YFM350X Wolverine 2WD [SRA] 2006 to 2009
Yamaha_YFM400 Big Bear 2WD [SRA] 2000 to 2004
Yamaha_YFM400A Kodiak 2WD [SRA] 2000 to 2004
Yamaha_YFM400FA Kodiak 4WD [SRA] 1993 to 2006
Yamaha_YFM400FB Big Bear 4WD [SRA] 2000 to 2006
Yamaha_YFM400FBI Big Bear 4WD [IRS] 2007 to 2012
