SIr GS-150 is one hell of a bike..CHange the stock oil at 200-300Kms..thenchange oil in intervals of 500Kms during running procedure,..Btw is it your first ride?..For first 300 KM not more than 40 Km/hr can be stretched till 500..The 5-10 Km/hr increase per 100 Kms.
Btw did you buy in instalments or direct cash payment?