Poor start:

improper idle speed adjustment, clogged idle speed channel, and choke cannot be closed. Troubleshooting method: adjust the idle speed according to the idle speed adjustment method; clean the idle speed metering hole and idle speed channel; check the choke.

 Unstable idle speed:

improper idle speed adjustment, clogged idle speed channel, air leakage in the intake connecting pipe, and serious wear of the throttle. Troubleshooting method: adjust the idle speed according to the idle speed adjustment method; clean the idle speed metering hole and idle speed channel; replace the throttle.

Too lean mixture:

the oil level in the float chamber is too low, the oil volume is insufficient or the oil circuit is not smooth, the main injection needle is adjusted too low, and the intake part leaks. Troubleshooting method: recheck and adjust the oil level height in the float chamber; adjust the oil needle position; clean and dredge the oil circuit and the carburetor metering hole, etc.; replace damaged parts.

 Too rich mixture:

the oil level in the float chamber is too high, the metering hole becomes larger, the main injection needle is adjusted too high, and the air filter is blocked.Troubleshooting: Recheck and adjust the oil level in the float chamber; adjust the oil needle position; clean the air filter; replace the metering hole if necessary.

Oil leakage: The oil level in the float chamber is too high, the gasoline is too dirty, the needle valve is stuck, and the drain screw is not tightened. Troubleshooting: Recheck and adjust the oil level in the float chamber; clean the fuel tank; check or replace the needle valve and float; tighten the drain screw.

 High fuel consumption: The mixture is too rich, the oil level in the float chamber is too high, the air metering hole is blocked, the idle speed is improperly adjusted, the choke cannot be fully opened, and the air filter is too dirty. Troubleshooting: Clean the carburetor; check the choke; check and adjust the oil level in the float chamber; replace the air filter; adjust the oil needle position.

Insufficient horsepower: The main oil system oil channel is blocked, the oil level in the float chamber is too low, the mixture is too lean, and the idle speed is improperly adjusted. Troubleshooting: Clean the carburetor; check and adjust the oil level in the float chamber; adjust the oil needle position; adjust the idle speed according to the idle speed adjustment method.