Pedal 125CC motorcycle consumes a lot of oil, and the oil drain pipe emits black smoke. What is the reason?

Motorcycles with pedals 125CC have high fuel consumption, and the exhaust pipe emits black smoke when the throttle is increased, which is caused by various reasons.

Mainly check the following aspects:

Check whether the air filter element is blocked or immersed in oil.

Check whether the electronically controlled air door of carburetor can't be closed after preheating, and whether it is always in the enrichment state; Check whether the mixing ratio screw of carburetor is improperly adjusted and whether the mixing ratio is too rich; Check whether the carburetor oil level is too high; Check whether the position of throttle main oil needle is too high; Check whether the main metering hole is too large or the foam tube has problems.

Check the negative pressure tank switch for damage. If the switch of the negative pressure tank is damaged, the oil will flow into the cylinder from the suction pipe, resulting in overflow of the cylinder or excessive mixture.

Check whether the exhaust valve is not tightly closed and whether the valve timing is too late.

Too much mixed gas will cause black smoke in the exhaust pipe and increase fuel consumption, which are basically caused by the above reasons. Check these aspects separately, and you should be able to find the cause of the failure.