1983 yamaha ss440 engine smokes excessively at

The symptoms you're describing with your 2KD Hilux engine (weak engine with mass smoke, vibrations on rev, and less power) could be caused by several different issues. Here are a few possibilities:

1. Excessive engine oil consumption: If the engine is consuming too much oil, it could be burning the oil and creating a lot of smoke. This could be due to worn engine components such as pistons, rings or valve seals.
2. Clogged air filter: A clogged air filter can restrict the airflow to the engine, causing it to run poorly and produce more smoke.
3. Timing issues: If the timing is off on the engine, it can cause poor performance, vibrations and smoke.
4. Fuel injection system issues: A malfunctioning fuel injection system can cause poor engine performance, vibrations and smoke.
5. Turbocharger problems: A malfunctioning turbocharger can also cause vibrations, smoke and less power.

Exhaust black smoke
The main causes of exhaust pipe blackening are less air in the cylinder, more fuel, incomplete or untimely combustion of fuel. Therefore, when checking and analyzing faults, look closely around this point to find out reasons. Check cylinder by using the method of oil cut, the first distinction is that the individual cylinder is not working well or all cylinders are not working well. If the black smoke disappears when a cylinder stops working, then the black smoke is caused by the bad work of individual cylinders. The reasons can be found from the bad work of individual cylinders.

The main reasons are:

A. Poor nozzle operation

The injection pressure of the injector is too low, the nozzle drips oil, the spray quality is not good and the oil droplet is too strong, all of which will cause the diesel fuel to burn incompletely. Therefore, in the detection of diesel engine cylinder knocking sound, exhaust sound uneven, that is, fuel injection problems, should be immediately checked and adjusted injection nozzle.

B. The fuel injection pump adjusts the tooth rod or the adjustment rod stroke is too large, resulting in too much fuel supply.

C. Valve clearance does not meet requirements, resulting in insufficient air intake.

D. The contact surface between the plunger sleeve of the injection pump and the valve seat is not sealed, or the locking screw of the regulating ring of the fuel injection pump or the loosening of the plunger adjusting arm cause the imbalance of the fuel supply and lead to intermittent black smoke emission.

More supports, please see on www.dieselgeneratortech.com

sounds like its got a stuck injector

If you need further help, I’m available over the phone at https://www.6ya.com/expert/randy_598ee00c65056cc9

There is nothing wrong with your car, the color of the smoke is a sign of good combustion.

Just letting you know that white is water, blue is oil and black is gas coming out of the exhaust.

Internal oil leak, change the spark plugs and cables, oil, filter and add Lucas oil. Take the car for inspection and let me know how it goes. For the belt depends where you get the parts and who does the work.