Engine cylinder head valves admit the air/fuel mixture and release the burnt gases.
Burnt valves need to be lubricated where the valves move up and down there is alot of friction and whats to keep it lubed is oil if you dont keep that up that is where the blue smoke coming out the tail pipe.
You can have a compression test done on the engine to determine the condition of the rings and valves.
Exhaust valves open at the appropriate time to allow the burnt gasses to escape.
blue smoke can be caused by sticking valves or burnt rings
Exhaust valves open at the appropriate time to allow the burnt gasses to escape.
Burnt valves will cause power loss. Another symptom will be the engine will run hotter than normal and use more antifreeze.
it could be numerous things. spark plugs, fuel injectors, burnt valves, distributor, plug wires .... its hard to tell with out hooking it up to a diagnostic tool.
you can tell if an DVD has been burnt because it will be brown
the oil is darkit smells burnt
a burnt valve looks like a wide crack in a valves' head. when a motor runs too lean, the cylinders heat up too much, causing the head of the valve to heat up faster than it can dissipate the heat, causing the valves' head to crack. once the valves' head starts cracking or melting away, you lose compression in that cylinder, and the engin will vibrate and it may not idle at all.
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.