does anyone have good starting points for both the idle mixture and idle screw? i.e. number of turns out from closed. screws were all akimbo from the prior owner adjusting them. thanks !

 

Find Trochoids profile and click onto the FSM.

 

Also, up in the FAQ (if you have a Nikki) there's https://www.rx7club.com/showthread.p...hreadid=310927

DD

 

Or do a search. Oh wait, you've only been in this forum for 3 years. You probably haven't heard about the search button.

 

FTW:

Mixture: Gently go clockwise all the way in, then go three turns out.

 

The FSM carb manual doesn't really help. I would personally like to know what is considered a turn? A full 360* or just 180*? This is stuff that should be addressed in simple terms for new members and re-archived

 

you want to go 1 1/2 turns out... that would be 3 180 turns.... all tho that is only a rule of thumb to get you close. you will have to do more or less till you get it spot on

cheers PaTricK

 

One turn would equal one "complete" turn (360 degrees). This will get you started, then there are methods of fine tuning beyond that. Sterling had a very thorough write-up on the procedure, which I believe can be found in the FAQ section.

 

i read those faqqs and just wanted a basic starting point which i didnt see in the faq or a search. see wasnt hard to say "go 3 turns out" thanks guys!

 

I can see how you might have missed it in the FAQ. It was hidden under the obscure title of "How to tune a carb".

https://www.rx7club.com/showthread.p...hreadid=310927

 

^ lmao. Plus Duble Durty already gave the link to that thread in the above post. In all fairness the FAQ question is the even more obscure "How to adjust the idle on a nikki carb" I didn't want to say anything...

 

You responded to a thread in which the last update is from 2007. He was only pointing out that you will get better answers searching instead of someone holding your hand.

 

The irony of giving someone grief about how to use a forum, while zombie reviving a post from 15+ years ago. LOL.

 

FWIW
Due to the heat from the engine and the necesity to go back and forth from the mixture to the idle speed, and the idle speed screw likes to hide, I bought two long screwdrives. The one for the idle speed stays put once the screw is located.

 

That doesn't help with an SA carb, though. The throttle position stays fixed, and you get an idle fuel screw and an idle air screw. The idle air screw adjusts both idle speed and mixture, whereas the other one only adjusts fuel.

It sounds screwy but there are major benefits to having the zero throttle position fixed, as far as transitioning from idle is concerned. I like it so much that I deliberately put a '79 carb on my '81.

 

Thank you for the clarification. I may be looking at rebuilding my 84 carb. The Haynes book has good illunstrations, but may not be completely accurate for the 81-85 years. I do have the 85RX7(4A)Fuel%26emissions_12A as a primary reference.