KC - here's a Parts List I used for pulling off the inner primary cover - CHECK ALL to verify they apply to YOUR machine !!!
98315 ; BOX SPANNER for 4 speed sprocket nuts Indian 4 speed
ST25098 ; ENGINE SPROCKET EXTRACTOR (2004)
ST25104 ; CLUTCH HOLDING TOOL (This may differ to picture shown in catalogue)
ST25099 ; CLUTCH EXTRACTOR
144752 ; GROMMET, ALTERNATOR CABLE, (144393)
200140 ; CHAIN TENSIONER BUFFER ASSEMBLY
140290 ; SCREW, CHAINCASE SEAL ADAPTOR PLATE
111888 ; SEAL AND ADAPTOR PLATE (BEHIND CLUTCH), 4-SPEED
144624 ; GASKET, CLUTCH OIL SEAL (140937)
560052; GASKET CHAINCASE, ELECTRIC-START MODELS ONLY
111086 ; FELT WASHER, NUT, GEARBOX SPROCKET, 4-SPEED, up to 2002 (2B511911A)
111161 ; LOCK WASHER, FINAL DRIVE SPROCKET
140327 ; SPACER, GEARBOX SPROCKET
H49/17 ; SPROCKET 17T, 4 SPEED, UK MADE
I went back to the stock 17T and it made my Bullet spunkier, 4th was a lot more useful in hill country. The PO had put an 18T on, but unless the engine is modified and makes some HP, it's just a strain on the stock motor. Or if you live in Kansas...