Smoke during early morning startup after the engine has warmed up meaning either one of your valve stem oil is leaking. If you have constant smoke during the operation of the bike, irrespective of the rev range, we might have a failure of piston rings which causes oil from lubrication to enter to combustion chamber and bring out as smoke. Or a combination of both worn piston rings and a leaky valve oil seal.
The cost of the stock plugs are close to 95 to 100 rupees per plug, compared that to NGK it's recommended to keep changing the stock spark plugs at set intervals, as that is both economical when you consider the plug prices of NGK. Though I would personally recommend you to get the NGK over Champion, the running costs don't make much a difference.
Right side plug:
NGK CR8E normal (normal) costs upwards of 150
NGK CR8EGP (G-power) 300 +
NGK CR8E IX (Iridum) 600 +
Left side plug:
NGK CR9E
NGK CR9EGP
NGK CR9EGP IX
Cheers!
VJ



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