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
That is something that would never need ajusted unless they start ticking are have been fooled with.
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.
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.
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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
There are three main types of valves used for bike tires: Schrader valves, Presta valves, and Woods valves. Schrader valves are the most common and are similar to those found on car tires. Presta valves are thinner and require a separate pump attachment. Woods valves are less common and are often found on older bikes.