Royal Enfield — royal enfield 350cc :engine tapping (tak tak) sound

Address:

Visakhapatnam, Andhra Pradesh

This is k venkataratnam ramayya from visakhapatnam, andhra pradesh. As i bought the royal enfield classic 350cc with an chassis number: me3u3s5c1fe222873 in 2015.

I was facing the tapping sound since my free servicing. When i was giving my bike for servicing, i always asking them to fix tapping sound which occurs frequently. But they didn't fixed it till now.
Servicing address is

Royal enfield company service station
Address: 20, hb colony rd,
Krm colony,
H b colony,
Visakhapatnam,
Andhra pradesh.
530022