What happened to my bike engine I hear different sound
Bike: 2018 Bajaj Pulsar 150 BS4 (carb)
Problem started after I adjusted the air-fuel mixture screw.
Current symptoms:
Bike starts and idles properly
Runs normally at low/mid RPM
Won’t go above around 8000 RPM
Engine sound becomes louder/different at high RPM
If I partially block the air intake with a cloth, the bike runs better
Small popping/backfire sound from exhaust sometimes
What I checked:
Idle is stable
Bike is not stalling
RPM and speed both stop increasing after ~8000
Could this be:
lean mixture,
intake air leak,
clogged main jet,
or something more serious like valves?
Any advice on what to check first?