In automobile :
Black smoke in all time & poor pick due chowk the rout of carburettor
and poor mileage.
Bishnu
A bad, stuck or dirty float needle inside the carburetor.
bad seal in between your intke manifold and carburetor
yes it is a bad sign
Bad timing/valves/rockers/timing chain
uneven or non true surface of 1 or all surfaces, wich can cause a bad seal. or a carburetor that you have had rebuilt by 2 separate people but still it is still not working properly ( like my self )
How does it run? If it is running rich or lean then the carburetor could be the culprit. If it is original from 1986 I would bet it needs a rebuild.
check your belt
Bad\dirty carburetor or not getting gas.
carburetor or spark plugs
its fuel injected, no carb on that bad boy
Numerouse possibiities, bad gas, bad carburetor, bad spark plugs, bad spark plug wires, bad ignition coil, bad battery, bad ignition swithc, etc..
if you definitely have a carburetor,most likely you have a bad purge valve when the diaphragm goes bad it allows the motor to suck raw fuel through the vacuum hoses into the engine