Back to the problem, the aging 4G15p already clocking at 200K KM mileage and haven't done any major overhaul. Recently the engine will shaking after turn off the engine and the symptom looks like it running rich and there is fuel in the combustion area. The next problem is the fuel consumption is pretty high where about RM0.25 per KM and this consider bad for a 4G15p manual engine.
First thing to do is open up the air filter cover, remove the the air filter. You can clearly see the carburetor opening valve which it suck in air from the filter. I did not remove the entire air filter cover so can really see the whole carburetor.
Next, spray the carb cleaner to the carburetor without starting up the engine. You can obviously see that the carburetor is being cleared.
After doing that, the engine is easier to start. I already pump in a full tank of fuel. Let's see what happen after a week whether this will improve the fuel consumption of the aging 4G15p or not.