Valve clearance need adjusting a fraction. not dangerous, better to be a tad loose than too tight and have valves partially open.
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year make model adjust valve clearance
It's an easy job and will take 15 minutes with basic tools and a feeler gauge.
https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk03IHsZ6iXxD-60eHjyK0Amn6xmIrA%3A1604713857741&ei=gf2lX-LfLNXQtQaV77ww&q=honda+160cc+valve+adjustment
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SOURCE: Ticking noice
If your not already, try using a genuine Nissan oil filter next time you get your oil changed. Most aftermarket filters allow the oil to drain back so when you start up cold the filter is in essence dry and not primed most likely causing the noise your experiencing. This would be the first thing I would reccommend checking.
SOURCE: Steering Wheel noise on cold start
this is either a loose belt, or low power steering fluid. Remember that Honda uses a diffrent power steering fluid from everyone else. Make sure it is a Honda compatable fluid, or you will get leaks.
SOURCE: Engine ticking noise on cold starts
Sounds like a stuck valve lifter. I'd use some oil additive for unsticking lifters.
SOURCE: ticking noise
you need to give us more info about your car, based on your info i would say one of your valve lifters is bleeding off pressure when the engine is off, you can try putting 1/2 qt. of automatic transmission fluid in your engine oil, atf is a good cleaning agent and may clean your lifters up. i have done it many times
SOURCE: spark plug gap for honda 160cc engine
The Gap is 0.028 and the Spark Pulg should be an NGK BPR6ES.
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