But, in your case 12k is very early. There could be a lot many reasons for it (may be a rare case, but can't rule out service guys replacing it with old one for somebody else). The chain of Dazzler being closed chain, you can't remove a few links and make it tight.
For 20k kms, 2000 on o-ring chain is not a huge maintenance. Except this, there is not much maintenance on the bike. I have never got bill more than 1000 so far.
Apart from changing the chain-sprocket, there is no other way for you. Change it for this time, check the measurement of chain before you give for the service and check immediately after you get the bike back from service.
Regarding chain maintenance, I give my bike for waterwash every week. Pressurized jet of water on chain would remove all the dirt. I will allow the chain to be dry for sometime, and then use OKS chain spray. One spray would come for at least 500 kms.






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