I own a TVS Apache RTR. Recently I have started to hear grinding sounds from the gear box. When I showed it to a authorised service centre, says that it's due to the sprocket being damaged.
But the thing is even if the chain is loosened, after 100kms again the chain gets so tight that the rear wheel doesn't even rotate unless rotated very hard.
My questions are,
- Why does it keep getting tightened every time?
- Does the chain sprocket has to do with any of this?
- If yes, is it required to replace the rear sprocket as well?
Edit: On looking closely at my chain I see that the Centre portion of the chain looks like it has been scratched. I can feel the roughness.
I got the chain cleaned and oiled. It became sufficiently loose again. But the sound is still there.
Update : Chain cleaning and oiling reduced the intensity of sound. Changed the engine oil. Oil level was quite low. Added new synthetic oil (Grade 20W50).
Observation: The intensity of the grinding sound increases after riding the bike for around 30 kms on a highway, which is my daily one way commute. The intensity lowers when the engine cools down. can there be any misalignment in the gear box causing to amplify after expansion due to heat.
Just want to get it verified before asking the mechanic to open the gearbox and see if there is any problem.