Why does my motorcycle rev high when I start it?
The ideal idle RPM for bikes ranges between 600 and 800. During a vacuum leak, the oxygen sensors detect the extra air and signal the EFI (Electronic Fuel Injection system to release more fuel to act on the air, and this results into a higher or lower idle than usual.
What is the idle speed screw on a carburetor?
There is an idle speed screw that adjust the opening of the throttle plate, and an idle mixture screw that limits the flow of fuel at idle. You want to adjust this second screw. As always, consult the owner’s manual or shop guide for your make and model, if you can’t find the screws.
How to troubleshoot an automotive engine high idle?
The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Step 1 – If the check engine or service engine light soon has illuminated retrieving the diagnostic trouble codes could lead you in the right direction of what the problem is, or is related too.
Why does idle speed drop during cold startup?
If the idle air control valve did not compensate for these, the idle speed would drop when certain accessories are used. In severe cases, the engine may even stall. The idle air control valve is most important on a cold startup. Problems with the idle air control will be most obvious during this time.
What should idle mixture and idle speed be?
The idle mixture and idle speed are set to factory specifications from the manufacture. However, over time periodic adjustments will be necessary for optimum performance. When making adjustments to the carburetor, it may be necessary to adjust the carb settings while the motor is running in a test tank or out on the water.
There is an idle speed screw that adjust the opening of the throttle plate, and an idle mixture screw that limits the flow of fuel at idle. You want to adjust this second screw. As always, consult the owner’s manual or shop guide for your make and model, if you can’t find the screws.
Is it possible to adjust idle mixture on CV carbs?
This is impractical for bikes with CV carbs, since the effects of the needed ¼ to ½ turn adjustments to one idle mixture screw are imperceptible to ordinary mortals.
The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Step 1 – If the check engine or service engine light soon has illuminated retrieving the diagnostic trouble codes could lead you in the right direction of what the problem is, or is related too.
If the idle air control valve did not compensate for these, the idle speed would drop when certain accessories are used. In severe cases, the engine may even stall. The idle air control valve is most important on a cold startup. Problems with the idle air control will be most obvious during this time.