my 85 GSL idles at about 1000rpm... that seems kind of high. is that what everyone else is getting? do you think this is severely affecting my gas mileage?

 

ideally, 700 to 850 rpm, 1000 rpm does seem to be high

 

i can't get mine to go under 1100. :-/ it was at around 900 when i was running it way too rich,but now i have it running not too lean or rich, and it's at 1100. dont you just adjust the idle at the linkage facing the drivers side of the carb? or is it the one in front of the carb near the main pulley with the srping in it?

 

A wll tuned 12A will idle at 700 rpm. The offical specs are 750rpm plus or minus 25.

!000rpm is high but should not necessarily increase fuel consumption significantly. Ported engines are a different matter, I have seen a bridgeport not liking below 2000rpm.

 

As you change the idle speed screw, you usually end up changing the fuel mixture screw.

it's a dance that should end up at 750, but usually ends up between 800-1100. If you're uncomfortable with it, reset them (making sure to write down how many turns out you were) and start from scratch - it's a game that goes on for hours that the whole family can enjoy!

 

It's really not too hard, just two screws to play with. I have mine idling at around 650 now that it's summer. When it's winter I bump it up to 800.

 

but where is the idle adjustment screw? anyone got a pic? my haynes tells me but i don't see it there. is it something you adjust with a screwdriver like the air/fuel?

 

yeah, can someone post pics of which screws to turn?

 

Pic cross-posted from here
http://mazspeed.bcrx7.com/forum/thre...847&boardid=44

 

thats a funny looking carb.
the 2 screws (idle and mixture) will be behind all the rats nest (if u still got it) there willl be and large and small screw.. the haynes manual does show it, im sure of it..

 

it's a carb with a lot removed and it allows detail to be seen

 

The Haynes manual says not to mess with the mixture screw on newer models. Plus, at least on mine, the mixture screw has a metal cover over it that I haven't bothered to remove yet. Mazda should trust us more. We know what we're doing.

 

Stock Nikki: anyone wanna volunteer how many turns on each you're running? Just to give me a basis from which to start testing things for mine... never done any carb work before...

 

FSM says 3 turns out is where you start.

 

i got mine on 3 1/2 and its running a lil rich.

which way leans it out, in or out??

 

In for lean, out for rich

 

Mine will idle at 1500 when I come to a light, and then I have to put my toe under the pedal and pull up to drop it to 750... Any ideas what could be causing this?

Dan

 

sounds like your accelerator cable is over-tightened.

 

3 turns out on which screw tho? Mixture or speed? (assuming mixture since you're talking about rich/lean, but I just wanna make sure, who knows what could happen if I start messing with the wrong screw 3 turns out? Idling past redline.. hehe :P)

Jon