Carburetor info, 1988 Yh63 y4 engine

[Joshsigood]

Hi, I was just wondering if anyone had any info on my carburetor, mainly want to know which screws are idle mix and idle speed and what the other adjustment screws are. And any advice on tuning it up. I've attached some pictures of the carburetor and adjustment screws, any help would be appreciated, cheers Josh.870687078708

[llamavan]

Hi and welcome to TVT!

Check out this thread (https://www.toyotavantech.com/forum/showthread.php?5323-Searching-TVT-successfully-and-posting-new-threads) about successfully searching the forum. Good news — all threads on carburated Vans are tagged "carburator/carburated" (bad news ... because there aren't many).

Gwen

[Joshsigood]

Thanks gwen, just had a search but couldn't find anything relevant. Also if anyone can recommend Any other forums that might have some info, that would be appreciated too, cheers

[Burntboot]

Hard to tell from the pics but....

Idle speed is easy, go to the throttle linkage and articulate it with the choke flap held open, watch it move and you will see what screw it lands against.

There will be several screws that will look ripe for turning but shouldn't be touched.
You can adjust those screws all day long and it won't seem to do a damn thing.
Fast idle is a good example.
And you dont want to fire up that engine with the fast idle screw fully tightened.

If you do "adjust" anything, keep track of direction and # of turns so you that you can always go back to where you started.

Mixture screw, if exposed, should be a spring loaded affair, but will be into the main body of the carb. It may also be hiding behind a soft metal cap.

Maybe check out the pick up truck forums, I cant imagine it would be much different from what you would find bolted onto a 22R