Bike is Cbz old 2000 model, i dont ride often in monsoon, when i took out her after a week when moving from stoo positionnin first gear i heard a rattling noise from bottom part of engine, sound is like some metal balls are hitting the empty metal box. Its not showing in neutral or when on double stand in first gear,but its coming up only in load on transmission, mechanic first said its coming from front sproket but after cleaning and lubing the chain noise is still there, now he is saying maybe one bearing is got play in transmission, i opened up clutch side to check any loose parts but everything is good there. To chnge bearing whole engine have to open, and i want to avoid that, plz help with this issue to identify the cause of this sound,
recently engine lost a compression, after removing spark plug she started.
I poured 2t oil with petrol to coat the tank from inside after raining started.