Kawasaki KX100 Phathead Combustion Chambers GASGAS TTR250 YFM250 Bear Tracker YFM350FW

TTR250 YFM250 Bear Tracker YFM350FW Big Bear 4x4 YFM350U Big Bear 2x4 YFM350X Warrior YFM600FW Grizzly 4x4 YFS200 Blaster YFZ350 Banshee 1998

KX250 (2005-2007)

Athena144 9

KX85 & KX100 up to 2013 (see other cap for 2014+)

Kawasaki KX100 Phathead Combustion Chambers GASGAS TTR250 YFM250 Bear Tracker YFM350FWChamber selection: KX40 7. 4cc Stock compression KX41 6. 4cc (95+ octane) KX42 6. 0cc (100+ octane) KX43 5. 6cc (105+ octane) KX Stroker insert for Hotrods crank (listed as +4mm) is actually a +2mm Hotrods has only one part number for the stroker so we are sure that there is not a +2mm and +4mm If you have a Hot Rods stroker crank our insert will work