How to see whether the throttle is clean and how to judge whether the throttle is clean?

1. When the pointer quickly drops to 1000 to 1200 rpm, the pointer will pause a little, then drop to about 800 rpm, and the idle speed will be stable. The throttle is completely normal at this time!

2. When the pointer quickly drops to about 800 rpm and stabilizes, the throttle is slightly dirty, but it still doesn't need cleaning, which is basically normal!

3. When the pointer quickly drops below 800 rpm or even 700 rpm, and then slowly rises to around 800 rpm, and the idle speed follows from small to large, then the throttle valve is seriously fouled and needs to be cleaned immediately!