Namura Forged Top End Rebuild Kit for 2010 13 Honda CRF250R 76.77mm FX 10039 BK 2009 Polaris RZR S 800 EFI Part Number: W6141 Part Number: W6141 MAINTENANCE and TUNE UPTune up Fuel requirements Air filter Engine oil and filter Engine oil pressure check Front differential Final drive oil Cooling system Spark plug Valve clearance Engine compression check Fuel hose inspection Breather hoses inspection Throttle body and air intake joint inspection Accelerator cable adjustment Ignition timing inspection Select lever adjustment Drive belt inspection Engine break in Specifications SpecsCHAPTER FOUR ENGINE TOP END AND EXHAUST SYSTEMExhaust system Cylinder head Camshaft and rocker arms Cam chain and guides Valves and valve components Cylinder Piston and piston rings Specifications SpecsCHAPTER FIVE ENGINE LOWER ENDBalancer and oil pump gears Oil pressure relief valve Cam chain and guides Crankcase Crankcase seals and bearings Relief valve and oil pipe adapter Crankshaft Balancer shaft Oil pump Middle gear bearing housing Middle driven pinion gear bearing housing Middle driven shaft Middle gear assembly shim and lash adjustment Universal joint Shifting check Specifications SpecsCHAPTER SIX CLUTCH and SHEAVESDrive belt air duct assembly Drive belt cover Outer bearing housing Drive belt Primary and secondary sheaves Left crankcase cover Centrifugal clutch Specifications SpecsCHAPTER SEVEN TRANSMISSION and SHIFT MECHANISMSelect lever assembly External shift mechanism Transmission Shift drum and forks Specifications SpecsCHAPTER EIGHT FUEL INJECTION SYSTEMFuel injection FI Fuel delivery system tests Fuel tank Fuel pump Fuel level sender Fuel injection system relay Throttle body Fuel rail and fuel injector Idle speed control unit Throttle position sensor Engine control unit ECU Intake air pressure sensor Intake air temperature sensor Coolant temperature sensor Crankshaft position sensor Speed sensor Lean angle sensor Rollover valve Air box Air intake duct Accelerator cable Specifications SpecsCHAPTER NINE ELECTRICAL SYSTEMElectrical connectors Battery Charging system Regulator rectifier Right crankcase cover With the Namura complete Top End Rebuild Kit A Top End rebuild can help to improve the performance of your ride