Honda bike 160cc oil changed since 1600 km due to tappet noise valve clearence done . After that in cold start til tik noise then few seconds it gone away. Provide solution for problem

SOURCE: Engine noise cold

these motors made some noise when cold normally due to the clearance. Is it more than that? Have you tried removing plugs and soaking pistons overnight with topengine cleaner this will loosen carbon which makes some cold noise problems.

SOURCE: tappet/valve settings???

o.25mm when hot this is for inlet and outlet

SOURCE: Engine ticking noise on cold starts

Sounds like a stuck valve lifter. I'd use some oil additive for unsticking lifters.

SOURCE: tappet valve noise

Heavy oil like 20w50 usually isn't the answer for collapsed lifters. Ticking usually happens when the oil supply to one or more of your lifters is compromised. If all your lifters are tapping it is probably your oil pump or its screen. If one lifter is tapping it is probably dirt or a blockage in that lifter's oil supply. Replace your oil with the correct weight oil and try Sea Foam engine treatment. Don't expect instant results. It can take a while to unstick a blockage in those tiny passages. Keep your oil clean.

SOURCE: 2008 toyota sienna limitedloud engine noise like

I have a 2009 with the same problem that the dealer told me was "normal" engine noise. BTW, our loaner does not have this noise.