Screw the spark plug back in and start the engine. Pour a teaspoon of fuel into the spark plug hole.

A dry plug may indicate a plugged fuel filter, leaking mounting gaskets on either end of the carburettor, or a stuck or clogged carburettor inlet needle. A wet plug may indicate over-choking, water in the fuel, or an excessively rich fuel mixture. If the engine is equipped with a fuel pump, make sure it operates properly.Remove the line and check for blockage.Fuel will not reach the carburettor if the fuel valve is closed. Open the fuel valve (if equipped), located at the base of the fuel tank where the fuel line is attached.Debris in the carburettor often causes performance problems. Spray a small amount of carburettor cleaner on the shaft of a sluggish choke and into the venturi to loosen grit.A choke that does not move freely or close properly can cause difficulties in starting. Check that the choke plate closes easily and completely. Remove the air cleaner and inspect the choke plate mounted on a shaft at the opening of the carburettor's throat.Commercially available carburettor cleaner comes in convenient spray cans for periodic cleaning of both inside and outside the carburettor. Luckily, you can take care of many of these problems quickly and easily-often without even removing the carburettor from the engine. Deposits inside the carburettor can clog fuel and air passages and reduce performance or stop the engine altogether. Constant vibration and wear can affect the setting of the carburettor's mixture screws (if equipped).Īnd with all of the grass, twigs and other debris that a small engine encounters, it's not surprising that even passages inside the carburettor eventually pay a price. Next, the linkages attached to the carburettor's throttle and choke plates can bind or stick when dirty. A clogged air filter is a common cause for black smoke emitting from the exhaust. First, make sure that the air coming into the carburettor is clean and free of debris by inspecting the air filter. A big part of ensuring a smooth-running engine is keeping your carburettor and linkages clean and well adjusted.

Daihatsu dm950g carburetor