Jump to content

Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse

- - - - -

Help with Hitachi Carb idle mixture setting?

  • Please log in to reply
4 replies to this topic

#1 s'ko



  • Members
  • 1,722 posts
  • Los Angeles

Posted 19 January 2005 - 12:16 PM

I have a 82 BRAT, EA81 w/a Hitachi Feedback Carb

Someone messed with the idle mixture setting.

Does anyone know what it is suppose to be?



#2 swiftt


    USMB Regular

  • Members
  • PipPipPip
  • 89 posts
  • Portland, OR

Posted 19 January 2005 - 12:20 PM

14.7 to 1

air to fuel ratio.

#3 monstaru


    wow, relevance....

  • Members
  • 4,452 posts
  • OlyWa

Posted 19 January 2005 - 01:24 PM

ifyou don't have a meter, that means,seat the idle mixture screw lightly(all the way in)not tight,but just to where it starts to get tight.then back it off about two whole turns.start the engine,let it get warm ,have someone watching rpms and if you have to have it pass emissions, do not go below around 950 rpms,if you do not ,put it where you want it at.it is a touch and go type of thing.you may get different responses to rpms if you have rebuilt it, cleaned some of it but not all,etc....

#4 s'ko



  • Members
  • 1,722 posts
  • Los Angeles

Posted 19 January 2005 - 03:08 PM

Thanks for the quick response:

I have to pass emissions. I do not have a tach so how can I determine the RPM w/o one?

#5 Snowman


    Midnight Passenger

  • Members
  • 3,538 posts
  • Haines

Posted 19 January 2005 - 07:34 PM

You basically have to guess at the RPM if you don't have a tach. Just set the idle speed to whatever it likes the most.

For setting the idle mixture. Get your idle speed about where you want it, then adjust the idle mixture screw to the setting where the engine idles fastest. Then adjust the speed screw until it's back down where you started. Now adjust the idle mixture screw again. Repeat this process a few times, then turn the idle mixture screw in until the RPM drops just a tiny bit. This is apparently what you want for passing IM. Afterward, feel free to adjust back to where it idles best.

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users