How Do I adjust the...

[CenValyCali]

Mixture screws? What is everyone using to do this? Sockets won't fit, neither will any of my tools. It's a rectangle and I can't get it out with needle noses. Please help. I'm doing a rebuild. O yeah it's a Rochester carb. Thanks

[ray_mcavoy]

I have a newer 80-something Q-Jet carb on my 77 plow truck that has those oddball mixture screws too.

I ended up making a tool out of a scrap piece of brake line tubing. 3/16" I think. Just squashed the end a little bit in a vice to give it sort of a double-D shape that fits the heads of those screws.

[datguysaL]

get a piece of rubber hose, small enought to fit tight. and adjust as needed, some auto parts store also carry the a set with a variety of small sockets with a long flexible scredriver type thingy.

[tucsonjwt]

You can get a double D carb adjustment tool from Autozone, Pep Boys, etc. for cheap. Still, I find the adjustment is still iffy getting it to stay in place while doing the adjustment, but if the carb is off the truck - should be no problem.

[CaliDude76]

This is what I use to adjust the air mixture screws on my 84's Q-Jet... The tool has different sizes at both ends and flexes.. works like a charm... My dad got it from Napa Auto Parts in Visalia, Ca.. a while ago

[CenValyCali]

Thanks everyone for the ideas. Cali dude does one of those ends look like it would fit a rectangle?

[CaliDude76]

Originally Posted by CenValyCali

Thanks everyone for the ideas. Cali dude does one of those ends look like it would fit a rectangle?

Yes... sorry bro.. that one close-up didnt work to good....., but it does have rectangular ends on both sides.. apparently some carbs have different size deals to adjust. good luck

[85Bowtie]

I thought the Quadra Junks were pre-set from the factory and had no provisions for adjusting the idle mixture without drilling something out or something funky like that.

Are you attempting a rebuild on the carb or the whole motor? If you're unsure of how to adjust the idle mixture on a Q-Jet you might as well forget about rebuilding it and just get you an Edelbrock.

[68 TT]

Originally Posted by 85Bowtie

I thought the Quadra Junks were pre-set from the factory and had no provisions for adjusting the idle mixture without drilling something out or something funky like that.

Are you attempting a rebuild on the carb or the whole motor? If you're unsure of how to adjust the idle mixture on a Q-Jet you might as well forget about rebuilding it and just get you an Edelbrock.

I know some Q-Jets had small caps put over the mixture adjustment screws to prevent people from tinkering with them. You can knock them out and get to the screws though. I had an emissions inspector try to fail a car once because the plugs were missing. I had to go to his supervisor and reason with him to get past it.

[85Bowtie]

Originally Posted by 68 TT

I know some Q-Jets had small caps put over the mixture adjustment screws to prevent people from tinkering with them. You can knock them out and get to the screws though. I had an emissions inspector try to fail a car once because the plugs were missing. I had to go to his supervisor and reason with him to get past it.

I knew it was something like that. I haven't looked at one in 10 years, I wised up and went to an aftermarket carb. It seems alot of people nowadays are wanting to run these things and I have no idea why.