Carlisle Ultimax 3 has evolved into Ultimax PRO. Thicker cross section so more surface area is in contact with clutch. New cog design dissipates heat and aids flexibility Runs cooler for better performance. Run cool, run long & run fast with Ultimax PROAdditonal Fitment:2006-2010 YAMAHA APEX GT2010-2010 YAMAHA FX NYTRO MTX SE 1621994-1996 YAMAHA VMAX 500 LE1999-2001 YAMAHA VMAX 700 DELUXE2003-2006 YAMAHA RX-1 MOUNTAIN2002-2002 YAMAHA SRX1998-1998 YAMAHA VMAX XTC DELUXE2007-2007 YAMAHA NYTRO ER2009-2010 YAMAHA APEX LTX GT2005-2007 YAMAHA RS RAGE1994-1995 YAMAHA VMAX 600 ST2008-2008 YAMAHA APEX LTX GT1998-1998 YAMAHA VMAX 700 XT2000-2000 YAMAHA SX 700R1997-2006 YAMAHA VENTURE 6002008-2010 YAMAHA RS VECTOR LTX GT2008-2008 YAMAHA APEX MTX SE MOUNTAIN2008-2009 YAMAHA RS VECTOR LTX2007-2007 YAMAHA VENTURE LITE2008-2010 YAMAHA APEX LTX1994-1996 YAMAHA VMAX 500 DX2008-2008 YAMAHA APEX MTX MOUNTAIN1997-1999 YAMAHA VMAX 600 SX2003-2006 YAMAHA SXVIPER MOUNTAIN2001-2001 YAMAHA VMAX 600 ER2007-2007 YAMAHA RS RAGE GT2004-2004 YAMAHA RX-1 (4 STROKE)1994-1996 YAMAHA VMAX 600 LE2004-2004 YAMAHA RX-1 MOUNTAIN (4 STROKE)2009-2010 YAMAHA FX NYTRO RTX SE1994-1995 YAMAHA VMAX 500 ST2006-2007 YAMAHA ATTAK2008-2010 YAMAHA APEX2005-2006 YAMAHA RX WARRIOR2001-2001 YAMAHA SX 600 R1998-2000 YAMAHA SRX 6002004-2004 YAMAHA RX WARRIOR (4 STROKE)1999-2000 YAMAHA VMAX 6001994-1996 YAMAHA VK540 II2001-2001 YAMAHA VMAX 700 ER2004-2006 YAMAHA SXVENOM1997-2002 YAMAHA MOUNTAIN MAX 6002010-2010 YAMAHA FX NYTRO MTX SE 1532002-2002 YAMAHA SX 6002005-2009 YAMAHA RS VECTOR ER2007-2007 YAMAHA VK PROFESSIONAL2001-2001 YAMAHA SX 700 R2003-2006 YAMAHA RX-1 ER1998-1998 YAMAHA VMAX 700 XTC2000-2001 YAMAHA PHAZER MOUNTAIN LITE2001-2001 YAMAHA PHAZER 500 DELUXE