Two Idle Screws?

**lw316** · 28-12-2006 06:00 PM

Hey guys

My engine is a D15B4 Dual Carby. The pink arrow points to the idle screw, but there is also another screw pointed to by the blue arrow that affects idle. Does anyone know what this screw is for?

**EG5[KRT]** · 28-12-2006 06:17 PM

mixture regulation ?

**Edgeauto** · 28-12-2006 07:09 PM

pink is base idle
blue is A/C and load idle up
there is a screw on the end also which is for fast ilde

**lw316** · 28-12-2006 09:11 PM

Cool thanks
I noticed that the lever that the blue screw is attached to moves as i turn on/off the lights, A/C...etc. But I thought this was meant to be the task of the EACV?(increase rpm with increase load)

**Edgeauto** · 28-12-2006 09:37 PM

The EACV on the dual carbys do nothing but make it run rough. I have had to block the EACV on a few to get a good idle.

**ECU-MAN** · 28-12-2006 09:39 PM

this honda carb setup is complex and weird, but when working well does a great job.

even tho it has an eacv it also has about 2 or 3 vacumme solenoid operated idle up sysems as well

**Breezy** · 01-01-2007 09:11 AM

Originally Posted by Edgeauto

pink is base idle
blue is A/C and load idle up
there is a screw on the end also which is for fast ilde

Where is the screw for the fast idle located at?

**Edgeauto** · 01-01-2007 11:27 AM

To the right of the picture you can see the choke assy, do not touch any of the screws on it but where the choke cam pushes on the lever on the carb there is a screw you can adjust with a flat blade screw driver.