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If you adjust the valves at 0.08 you can skip adjustment to the second or third oil change othewise you usually have to adjust the valves especially cyl number 3 every oil change which is 3k miles
First of all, it's not 850cc, it's 805cc. You want to adjust your valves when they get noticeably louder or quieter. Louder = loose. Quieter = tight. Loose is better than tight. Too tight can lead to burnt valves and low compression. I adjust my valves at the start of every season.
That is something that would never need ajusted unless they start ticking are have been fooled with.
The error rate is less taht 1%. You should have your valves inspected often.
Change the plugs at 100,000 miles or earlier if the engine is not performing as it should.
Change your air filter every 30,000 miles or sooner if you drive in dusty conditions.
The factory recomends to inspect at 110,000 miles. I recomend every 30,000 miles.
No actual life expectancy, when it needs replaced, replace it.
Duplex valves are often used in seawater applications of valves as they are very corrosion resistant.
Worn engine rings or valves allowing oil to enter combustion chamber
Normally they're called valves. There are some trumpets out there with rotary valves, which are often just called keys.
valves