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Polaris Big Boss 250 6X6: 1991-1993
Valve Stem Seals + Clutch Kit – everything replaced for a completely refreshed top and bottom end
XJ-11631-01-97
The OEM studs are no longer available from Polaris
The only kit like it on the web
19+ YZ250F YZ 250F Stock Bore Cylinder Piston Complete Top End Rebuild Parts Kit Sportsman 400 Polaris Big Boss 250 6X6:CW20013K01,CW20013,40229M07700,8100025,B7B 11311 00 00,8957DA,C3695,362953,M1090C FITS ALL YAMAHA 2019+ YZ250F MODELS Aftermarket 77mm stock bore cylinder nikasil cylinder Wiseco, CP Carrillo, JE, or Wossner forged piston kit** (Includes pistons rings, wristpin, and circlips) Cylinder Bolts Head stud kit Vertex, Moose Racing, or Cometic Top End Gasket Kit (MLS Head Gasket) Viton Valve Stem Seals Heavy Duty Replacement Timing Cam Chain This is a bolt