yes he can if he is honest AND the tuning wil be ok whe he uses the tolerances specified in the manual such as valve clearance,clutch etc,, as these will be differentr for ravi so is the issue with the carbi,,
i would recommend an oil change when ur odometer reaches 800 ,, but never let it past 1000,, so if u r done 500 km do 300 km more and chane oil and check clearance ,, only if they r not ok u should repair them,, take the small book let page copy fromm manual to the mechanic and ask him to follow these,,