Engine level comes low in some reasons like the engine oil pump and oil screen are barely damage and clogged. There must be also a damage making the oil leaks from the engine itself. Decreased in oil pressure is because the engine oil level and viscosity are low.
Camshaft and crankshaft bearings may also be damaged or broken in some ways and also the relief valve is stuck open. The o-ring at the oil pipe in the crankcase is damage may also decrease the oil pressure. Oil leaks from your engine are abnormal condition and should be check at the time of presence.
For excessive white smoke, reasons may come through are valve worn out or valve seal is damage. Cylinder and piston are worn out making the combustion to not take properly. Fuel was mixed with oil or the engine oil level is too low.
If black smoke came out, Air cleaner must be clogged. The level of fuel in the float bowl of the carburetor reach too high. Main jet is too large in size or starter plunger was stuck open.
Brown smoke comes out the reasons would be the fuel level in the carburetor float bowl is getting too low or the main jet is small in size. Air cleaner duct must be loose and not mounted properly or air cleaner is badly sealed and missing.
Check for exhaust system carbon fibers content if there is still a stable amount inside your exhaust pipe. Make sure to check your exhaust pipes also for some problems or loose mounting.
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