new owner sniper 135mx

I currently own a 2nd hand Sniper MX 135. All stock but the carb was changed to 28mm when I bought the MC. Unfortunately the carb had some issues so I had to dispose and but another. Here lies the Problem: I bought a Keihin 26mm Flat Slide Carb and installed just yesterday. I am a newbie in...

Need ko lng advce kung kailan talga mag change oil. Wala pa po isang buwan Sii sniper nabili ko last dec 24, 2016 at 81k only. Na change oil ko na sya nung pumalo ang odo ng 500km, sabi sa guide book ko, next change oil is 2000km pa. Susundin ko ba un? Nasa 965km na pala odo ko ngaun. Nalilito...