Assalam o alaikum everyone new bike le hain unionstar 70 jo mene abhi almost 3500 chala li hain baki sab theek hain lekin jab main 50 ya 60 speed main hota ho aor accelerator chorh ke phir wapis deta ho to engine thori der ke liye zor chorh deta hain aor phir wpis sahi ho jata kya masla ho sakta hain? plugs changed twice air filter bhi carburetor is also fine and cleaned