KTM 250 SX-F (2006-2012) Tuning kit stage 4

Including new big bore cylinder 80 mm for years of construction 2006 to 2012 and CP - forged piston kit of the extra class 80.00 mm. The cylinder head is being redesigned: the valve seats are milled to improve flow and the transitions are optimized to increase performance. Including combustion chamber and channels, glass bead blasting. Price including top-end seal kit for years of construction 2006 to 2011. 

Please indicate the year of construction.