MUST REMOVE SOME ALUMINUM HERE FOR 54MM CYLINDER THESE ARE THE AREA'S TO BE TRIMMED FOR THE 54MM CYLINDER MAKE SURE TO SLIDE CYL. DOWN STUDS TO CHECK FOR CLEARANCE FOR THIS TO WORK WITH YOUR GEARS, THEY SHOULD LOOK LIKE THESE GEARS (LOOK CLOSE!!!) SHAFTS WILL VERY!! YOU WILL HAVE TO TARE DOWN THIS FAR TO INSTALL INSTALL THE 54MM STROKER CRANK ADD NEW CENTER CASE GASKET AND BOLT CASES TOGETHER YOU MUST TRIM CASE GASKET FLUSH OR BELOW THE CYL. OPENING SLIDE BARE CYLINDER DOWN STUDS AND MAKE SURE ALL IS FLUSH PUT ALL THE SHIFT DRUM PINS IN THE DRUM'S HOLES ADD DRUM'S PLATE, STAR AND BOLT,, TIGHTEN BOLT SLIDE IN SHIFT SHAFT AND PUT HOOK UNDER PLATE YOU WILL HAVE TO GO THIS FAR AND FARTHER TO INSTALL SLIDE_THE_BIG PRIMARY GEAR_THAT CAME_WITH REAPER_CLUTCH KIT_ON_THE MAIN_SHAFT YOUR'S_WILL_LOOK DIFFERENT THAN_THIS_ONE ADD ONE OF THE PROVIDED GOLD COLORED KNOTCHED WASHERS ORIDGINAL REAR CLUTCH TRX90 NOW ADD THE #8_CENTER BUSHING FROM THE ORIDGINAL TRX'S REAR_CLUTCH NOW ADD THE 2ND KNOTCHED GOLD WASHER ADD #14 THEN #10 FROM ORDIGINAL REAR CLUTCH DIAGRAM ADD #13 WASHER WITH "THIS_SIDE_OUT" LOOKING AT YOU ADD_#12_NUT AND TIGHTEN_DOWN,,, THE LARGE_PRIMARY GEAR_SHOULD HAVE_SOME FREEPLAY NOW_FOLLOW THE_DETAILED INSTRUCTIONS THAT_CAME_WITH THE GRIM_REAPER CLUTCH USE_THE_SHIFT SHAFT_THAT COMES_WITH THE_125_KIT NOT_THE_TRX'S THIS_I_HOPE WILL_HELP WITH_INSTALLING THE_SWIVEL_PART OF_THE_REAPER CLUTCH MAKE_SURE_TO TRIM_ANY_CASE GASKET_MATERAL THAT_MAY COME_IN CONTACT_WITH BOTTOM_OF_CYL. MAKE_SURE_TO TRIM_ANY_CASE GASKET_MATERAL THAT_MAY COME_IN CONTACT_WITH BOTTOM_OF_CYL. I LIKE TO ADD SOME OIL TO THE ROD LOWER BEARING ADD_THE_PISTON WITH_RINGS PIN_AND_BOTH CLIPS,,,THEN 2_GUIDE_PINS ON_STUDS AND BASE_GASKET FOR_THIS_BASE GASKET_TO_WORK ON_THIS_HUGE CYLINDER_YOU MUST_TRIM_IT A_LITTLE_BIT LIKE_THE_PIC SLIDE 54MM CYLINDER OVER PISTON !!!DON'T_BRAKE THE_RINGS!!! ADD_THE_BASE BOLT_FINGER TIGHT INSTALL_1MM ALLOY_HEAD GASKET OIL_DRAIN ORING AND LOWER_LEFT STUD_ORING AND_KEEPER FROM_OLD HEAD CAM CHAIN AND TENSIONER ROLLER ABOVE CRANKSHAFT ADD THE CENTER CYL GUIDE ROLLER AND CAMSHAFT SPROCKET YOU_MUST_INSTALL DIFFERENT_VALVE SPRINGS_THEN ROCKER_ARMS COVERS_AND EXHAUST_STUDS PUT_THE CAM_IN_AND SPROCKET,, SPIN_OVER_TO CHECK_THAT_THE VALVES_DON'T_HIT GRIND BOTH VALVES_ON_THE OUTSIDE EDGE TO_GIVE MORE PASSING CLEARANCE AT HIGH RPM'S THE_FRONT SPRINGS_ARE_THE ONES_TO_PUT_IN MONSTER_HEAD,, THE_ONES_IN NEW_HEAD ARE_TALLER TALLER_SPRINGS OUT_SHORTER_IN SHORTER_ONES HAVE_WIDER SPACING SET CAM TIMING AND TIGHTEN CAM SPROCKET BOLTS PUT_ON_CAM COVERS ADD_STATOR AND_FLYWHEEL FROM_ORIDGINAL TRX90 YOU_MUST PLUG_THE CLUTCH_COVER'S KICK_SHAFT_HOLE I_USE_A_RUBBER VALVE_STEM AND_LOCK_IT ON_THE_INSIDE USE HEAVY DUTY SYNTHETIC OIL ONLY !!!! I_PUT_THE_OIL IN_THEN_TIP THE_ENGING UPSIDE_DOWN AND SIDE_TO_SIDE REMOVE STOCK AIRBOX COIL_NORMAL MOUNTING AND_FUEL SWITCH ALSO_FLATTENED CROSS_FENDER SUPPORT_PIPE WE USE A BIG GUN EXHAUST (NOT_INCLUDED) SORRY FORWARD MOUNTED CARB CLICK PICTURE 2 TIMES WIRING_AND FORWARD MOUNTED CARB CLICK PICTURE 2 TIMES TEMP_WIRING ANOTHER LOOK AT THE CARB CHOKE PLUNGER STILL EASY TO GET TO GEAR PEDAL BOLT WILL JUST RUB A LITTLE BIT ACCESS CARB/CHOKE UNDER LEFT FENDER I_WIRE_TIE_THE CLUTCH_CABLE AWAY_FROM THE_HEADDER PIPE