A 150 cc four-wheeler may not idle down due to several factors, including a malfunctioning idle air control valve, a vacuum leak in the intake system, or an improperly set idle speed. Additionally, a dirty or clogged carburetor can disrupt fuel-air mixture, causing the engine to rev unexpectedly. Fuel issues, such as low-quality fuel or contamination, can also contribute to idling problems. Regular maintenance and inspections can help identify and resolve these issues.
You adjust idle with idle timing
turn the idle screw!
about 150 mph
probably about 150-165
anywhere from $150 to $2000..
anywhere from 50 to 150 gallons
idle air control motor where is it located
It's controlled by the PCM (computer)... there is no idle screw
check for a vaccum leak, broken or disconected vaccum hose, or accelerator cable may be sticky. hope this helps
Check for a vacuum leak.
On the driver's side of the F 150 carb, there should be the linkage for the throttle. On the linkage there should be a set screw that you can turn to adjust the engine idle.
your idle air control valve need to replace parts $200 labor $150 or clean it with carburetor spray if you're lucky that might solve the problem i clean my idle air control valve it help little maybe i didn't clean it up good my idle go up and down pretty high and then after i clean it sound much better but it still there idle go up and down slowly now the best way just buy a new idle air control valve engine light turn on hope its not o2sensor