12a carburetor

jerry · 03-14-2010, 02:09 PM

Hi i have a 1985 mazda rx7, it is misfiring, i changed plugs ang plug wires and put new catalyc converter on it, not sure what carburetor is on it, it looks stock, are there many different kinds?
Does any one have any pictures that would make it easier for me to understand where to adjust it, Thanks Gerald

Kentetsu · 03-15-2010, 10:37 AM

All of your answers can be found at www.sterlingmetalworks.com

Put your reading glasses on, and treat it like a study session. lol. There is literally an entire library's worth of information that he has collected over the years.

.

jerry · 03-17-2010, 09:14 PM

Hi Kentetsu, thank you for the reply, was wondering if anyone was out there. I`ve been researching it alot, and wow there is so many components that can cause problems, i was thinking that a 1985 vehicle would be easy to troubleshoot, but this is gonna be a extreme challenge, hats off to sterling, wish me luck, pretty sure i have a nikki 4 bbl

orion84gsl · 03-19-2010, 10:37 AM

If it's a stock car then yes, you have a Nikki 4bbl carb.

jerry · 03-20-2010, 10:33 PM

did some tweaking to it, is wierd i have only one adjustment screw on left side of nikki, book shows 2 one on top of the other, is this odd? is name orion as in p3orion? Car is very hard to get started is that a choke issue?

fire85gslse · 03-28-2010, 07:04 PM

a good service manual would help you as well

jerry · 04-06-2010, 10:17 PM

using haynes manual, but my nikki is a little different from the book

hecmanortiz · 04-07-2010, 02:58 PM

I've had Haynes manuals for 4 vehicles and have a tough time finding something in my car that is acurately depicted in their pictures. I use them mostly as a general source for information.
Good luck.

FerociousP · 04-07-2010, 03:09 PM

Quote:

Originally Posted by jerry

using haynes manual, but my nikki is a little different from the book

http://foxed.ca/foxed/index.php?page=rx7manual#firstgen

Download the '85 FSM. It should depict your carb accurately.

***There is also the '79-85 Mazda Carburetor Manual (blue cover) in the "Other" section which I found to be a good read.***

jerry · 04-12-2010, 09:22 PM

thank you so much, found the idle adjustment, car is running better now, i just keep tweaking the mixture screw, not sure i want to touch the idle one and it is very hard to reach

Kentetsu · 04-13-2010, 04:37 AM

At Sterling's site (link posted above), he's got a writeup on how to tune the idle which is definitely worth reading. If you do it right, you don't have to worry about high idle, stalling at stop lights, or premature hair loss. Check it out if you haven't yet, its located in the section titled Tuning the Nikki.

03-14-2010, 02:09 PM	#1
jerry The Newbie Join Date: Jan 2010 Posts: 9 Rep Power: 0	12a carburetor Hi i have a 1985 mazda rx7, it is misfiring, i changed plugs ang plug wires and put new catalyc converter on it, not sure what carburetor is on it, it looks stock, are there many different kinds? Does any one have any pictures that would make it easier for me to understand where to adjust it, Thanks Gerald

03-15-2010, 10:37 AM	#2
Kentetsu RCC Contributor Join Date: Feb 2008 Location: Grand Rapids, Michigan Posts: 530 Rep Power: 18	All of your answers can be found at www.sterlingmetalworks.com Put your reading glasses on, and treat it like a study session. lol. There is literally an entire library's worth of information that he has collected over the years. . __________________ "Learn from the past, or it will become your future...." '85 GS 12a + LSD/Sterling carb/Respeed coilovers/Respeed front swaybar/Respeed adj. rear spring perches/Illuminas/Bilsteins on rear AutoX vids @ http://www.youtube.com/user/Kentetsu1

03-20-2010, 10:33 PM	#5
jerry The Newbie Join Date: Jan 2010 Posts: 9 Rep Power: 0	did some tweaking to it, is wierd i have only one adjustment screw on left side of nikki, book shows 2 one on top of the other, is this odd? is name orion as in p3orion? Car is very hard to get started is that a choke issue? Last edited by jerry; 03-21-2010 at 05:41 PM. Reason: added text

03-28-2010, 07:04 PM	#6
fire85gslse RCC Addict Join Date: Feb 2008 Location: Middle TN Posts: 1,029 Rep Power: 19	a good service manual would help you as well __________________ I own A few Rotaries and Yes, I have a rotary problem. (SELLING OFF All my parts) 79SA(Respeed Car),93 FD (tweakit)

03-17-2010, 09:14 PM	#3
jerry The Newbie Join Date: Jan 2010 Posts: 9 Rep Power: 0	Hi Kentetsu, thank you for the reply, was wondering if anyone was out there. I`ve been researching it alot, and wow there is so many components that can cause problems, i was thinking that a 1985 vehicle would be easy to troubleshoot, but this is gonna be a extreme challenge, hats off to sterling, wish me luck, pretty sure i have a nikki 4 bbl

03-19-2010, 10:37 AM	#4
orion84gsl Rotary Fanatic Join Date: Mar 2008 Posts: 167 Rep Power: 18	If it's a stock car then yes, you have a Nikki 4bbl carb.

04-06-2010, 10:17 PM	#7
jerry The Newbie Join Date: Jan 2010 Posts: 9 Rep Power: 0	using haynes manual, but my nikki is a little different from the book

04-07-2010, 02:58 PM	#8
hecmanortiz Rotary Fan in Training Join Date: Aug 2009 Location: Hamilton, Ohio Posts: 40 Rep Power: 0	I've had Haynes manuals for 4 vehicles and have a tough time finding something in my car that is acurately depicted in their pictures. I use them mostly as a general source for information. Good luck.

04-12-2010, 09:22 PM	#10
jerry The Newbie Join Date: Jan 2010 Posts: 9 Rep Power: 0	thank you so much, found the idle adjustment, car is running better now, i just keep tweaking the mixture screw, not sure i want to touch the idle one and it is very hard to reach

04-13-2010, 04:37 AM	#11
Kentetsu RCC Contributor Join Date: Feb 2008 Location: Grand Rapids, Michigan Posts: 530 Rep Power: 18	At Sterling's site (link posted above), he's got a writeup on how to tune the idle which is definitely worth reading. If you do it right, you don't have to worry about high idle, stalling at stop lights, or premature hair loss. Check it out if you haven't yet, its located in the section titled Tuning the Nikki.