change the chain and sprocket in a set......as for when to
change....when it is unable to tighten and sprocket key all
spoil....maybe can ask yr mechanic to check for u whenever u do
servicing. btw what tires r u using? if u still using original irc
one.... i think it time to change new tyres....
There is also alot of things to add on to yr phantom like crashbar,
change handlebar, wind shield, change to louder horn, paintwork,
change pillion footpeg to flat type cos ta200 pipe is very
hot.
most important is to take care of engine oil, tires and brake.