What is the maximum speed of Pentium T77 at 4000 rpm?

There may be something wrong with the oil. Clean the throttle. What's more, you said that the engine speed can only reach 4000 rpm, stop in place and refuel at no more than 4000 rpm. This is how the engine is set up, and it is also to protect the engine.

Pentium t77 engine

When the vehicle is idling, it is normal that the engine of the vehicle has speed protection. The gearbox of the automatic transmission model has been damaged. The clutch plate of manual transmission vehicle is excessively worn, and the clutch plate pressure plate is damaged.

The engine speed is related to the number of times of work done on time or the effective power of the engine. The working conditions of the engine at rated power and rated speed are called rated working conditions, and rated power is not the maximum power that the engine can emit.

It is based on the maximum limit of the effective power used by the engine in use. The rated power of the same type of engine is different because of different uses.

The throttle valve is too dirty, and the fuel injector has too much carbon deposit. After a certain mileage, a dirty throttle will cause the throttle to close loosely or the idle stepper motor to get stuck, both of which will lead to the engine idling too fast. The carbon deposit produced by the engine during the working process can also cause the vehicle to shake, especially when starting the vehicle.

The engine will shake more than usual, and may even fail to start at one time. Therefore, when the vehicle is shaking, first check the throttle and throttle. If the throttle valve is found to be too dirty or the fuel injector has too much carbon deposit, it should be cleaned in time.