1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Adjusting the idle on stock Nikki carb

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Old Apr 1, 2003 | 10:41 AM
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Adjusting the idle on stock Nikki carb

I've searched around the forum and couldn't find anything related to this (maybe I didn't look hard enough?), but where do you adjust the idle? When I start the car it stays around 500 and if i hit the gas it dies (i have to pull the choke out until it stays around 1200 for a bit)
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Old Apr 1, 2003 | 11:06 AM
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Someone just posted a picture in another thread with the screws labeled, about a week ago. I don't know remember which thread, but you should be able to find it.

If the engine is cold, are you using the choke at all? Or just trying to drive?
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Old Apr 1, 2003 | 11:20 AM
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Yeah, I only use the choke when the engine is cold, after I drive around a bit and let everything warm up, it seems to be fine, but it still idles so low i'd like to try and turn it up... I think I saw the picture you are talking about, it's the yellow and red screw on the blue carb right?
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Old Apr 1, 2003 | 11:22 AM
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Yeah, there was a yellow and red screw. Can't remember the color of the carb. One is idle and one is mixture.
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Old Apr 1, 2003 | 11:32 AM
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You talking about this image? I tried to find these but couldn't.... i guess i have to take the blue air filter box off?

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Old Apr 1, 2003 | 08:29 PM
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Hey ... Don't tear things apart yet!! Using the above picture.....you'll be lookin' at the carb form the drivers front fender....
Your gonna need an extra long ( I use an 18" #2 phillips ) screwdriver to get down to the screws.

The red one in the center of the base plate is mixture.....and I've found is VERY sensitive to adjustment. ( Although I just figured out today my shutter valve is in the toilet...aka big vacuum leak )....so turn it very carefully.

The Idle speed is the other phillips head tan screw....and it is buried. You gotta go past vacuum tubing and hoses, etc....but once you find them it's easy.

Good Luck
BigPerm
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Old Apr 1, 2003 | 08:45 PM
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ok on mixture screw after i screw it all the way in how many turns to make it good!!! i need as acurate as you can give me!!
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Old Apr 1, 2003 | 08:49 PM
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yea me to i just screwed my mixture to hell and i need to kn ohow to fix it my car won't start :'( u help him then i read about it and we all go home happy
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Old Apr 1, 2003 | 08:54 PM
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hahahaha, well a good place to start is go all the way in. then turn it out around 3 - 3 1/2 notches. for me that was kinda rich, but a good starting point! lol, it's true that LEANER IS MEANER all motor, but be careful! hahaha WOOOOOWEEEEEEEE!
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Old Apr 2, 2003 | 02:59 AM
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Originally posted by dingo
You talking about this image? I tried to find these but couldn't.... i guess i have to take the blue air filter box off?

that picture is wierd, anyone else notice the carb is on the manifold backwards??


You might have to poke thru the rats nest to see the screws, and the idle one might have a plastic comver on it..


i'm getting my milage out of this picture, posted 2 times 2day for different reasons..
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Old Apr 2, 2003 | 09:39 AM
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he meant this.........





Thanks for the information, I have to set my carb, hehe....


Laterz, Andrew


EDIT :Ah man, I just realize thats an '80 Carb! Not a freakin 81-85 style..... .oh well.... back to my search for a good picture......

Last edited by 79+80+84_rx-7; Apr 2, 2003 at 09:42 AM.
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Old Apr 2, 2003 | 04:13 PM
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Finally.. a picture of those screws that match my carb!! I was starting to think that my New Zealand RX-7 was special haha!!

Seriously, it's great to know that I wasn't playing with the wrong screws!

..Matt
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Old Apr 2, 2003 | 08:14 PM
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Re: Adjusting the idle on stock Nikki carb

Originally posted by dingo
I've searched around the forum and couldn't find anything related to this (maybe I didn't look hard enough?), but where do you adjust the idle? When I start the car it stays around 500 and if i hit the gas it dies (i have to pull the choke out until it stays around 1200 for a bit)
shove paper towels down the throttle barrels that will lower the idle LOL

No seriously, what year carb is it?
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Old Apr 2, 2003 | 08:56 PM
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well today i found out that my idle won't go down easy because of me still have my acv connected!!!!!!!!!!!! DAMNIT!!!!!!! hahahaha, gotta get me a block off plate.
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Old Apr 2, 2003 | 08:57 PM
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Thats a SA carb, the later ones, like y 83 is different, the idle speed screw is towards the back hidden by that plate that secures the throttle cable. I wish it was like the SA carb, looks like its much easier to get to.
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Old Apr 2, 2003 | 08:57 PM
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Re: Re: Adjusting the idle on stock Nikki carb

Originally posted by MIKE-P-28
shove paper towels down the throttle barrels that will lower the idle LOL

No seriously, what year carb is it?
83, coupe s
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Old Apr 2, 2003 | 09:08 PM
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that picture is wierd, anyone else notice the carb is on the manifold backwards??
That cant be good...

~T.J.
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Old Apr 3, 2003 | 01:38 AM
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AAAHAHAHHAHAHAHAHAAHAHAHA, now i see !
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Old Apr 4, 2003 | 01:29 AM
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Originally posted by 79+80+84_rx-7

EDIT :Ah man, I just realize thats an '80 Carb! Not a freakin 81-85 style..... .oh well.... back to my search for a good picture......
WHAT? my carb is from a S1?? it was sold to me as a S2?? those dodge barsteds at (wont say who yet)....
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