research monkey

The car currently has the old front carb and the "rebuilt" carb in the rear. I was going to try to pull the butterfly and throttleshaft from my old one to swap over to the "rebuilt" one but the screws holding in the butterfly are wanting to strip. I originally purchased the rebuilt set because mine have a lot of surface rust / corrosion. Pretty sure they are the original set and the previous owner lived a block away from the ocean. Basically, I saw a set of pretty ones online that were noted to be freshly rebuilt so I did that instead of pulling the old, cleaning, polishing, cleaning, and rebuilding my old set. Oh, and no, I didnt paint them, the PO did ?

And it was definitely the throttle shaft butterfly. Looks like the previous owner he-man'd them on there (even looks like they used larger screws and retapped?). They also don't line up and are slightly offset of eachother.

Here are a few photos I just took.

Anyone have recommended vendors in the US for specific parts on an SU carb?

They buy carbs? I think i'll purchase the parts I need for the "rebuilt" carb and put it back together. Then throw it back in the car. Then maybe I'll rebuild and clean up the old pair that I have.

I think I found the problem. Butterfly had ZERO play and the shaft holding it looks bent...

Welp, without even an adjustment a simple swap over to the old carb and voila... issue gone. So now I guess I need to breakdown this carb and see where it went wrong with the previous owners rebuild.

Going to swap the front carb with my other one at this point to see if the issue continues.

Thanks, it did seem a little stuck on the return. I unhooked the choke cables and the air flow dropped down to between 15-20. The throttle adjust is still basically all the way out though so still trying to mess with it.

This is another one of those "i purchased "rebuilt" carbs, instead of rebuilding them myself" threads. I've been sitting on some rebuilt carbs (purchased online), MSA 6-1 Header, and MSA exhaust for almost a year now... Finally had the opportunity to install them this past weekend. I ended up pulling the ARA AC unit out as well. Before I end up pulling the front carb completely, just wanted to hear more opinions. Installed all the parts mentioned above and cleaned up anything I could as I went. Also threw in some BSPT 1/2" and 1/4" plugs in the balance tube. New blocks/gaskets for the carbs as well. Car fires up cold with the choke. Then after its @ operating temp, it'll start right up each time. Idle is about 1500ish. I started out originally with the jets turned all the way up and then down 2 full turns and the throttle adjustment nuts all the way in and then back out 2 turns. No matter what i did with the front carb, i could only get it to increase air flow, never reduce. The synchrometer i'm using shows 7 kg/h on the rear carb and 20-30 kg/h on the front carb. Fast idle screw is all the way back out, and I pulled the throttle adjustment screw out of the front carb completely just for the hell of it (thinking that maybe the butterfly wasnt closing completely). I took some time last night to search on the forums and google for anything. Everything pointed to maybe a vacuum leak somewhere. So today, i went and checked all the vacuum lines and plugs. I sprayed a little carb cleaner in various areas (balance tube gaskets and blocks, intake manifold where it meets the head, line that goes to the brake booster, carb blocks/gasket area etc) and never got the rpms to increase. Also pulled the dashpots and cylinders and made sure they were clean on the inside. I used 3 in 1 oil for the dampers. Return springs on the throttles look good and i believe attached correctly. Vacuum advance is plugged into the front carb. I have new plugs, points, rotor, cap, plug wires, coil etc. and they are ready to go in but I wanted to make sure I could get the car to idle under 1000 before i started messing with any of that. The car ran fine on the old SU carbs, compression was good, i believe the timing was at 10 degrees @ idle 700 rpms

Its so much more than the social stuff now. The group functionality and the marketplace have to be taking market share from Craigslist / Web Forums etc. I now double post for sale items on both FB and Craigslist and I'm finding that FB sells faster overall.

I believe you can only see group postings if you're part of the group.

Datsun 240z Classifieds group on FB. https://www.facebook.com/groups/datsun240zclassifieds/permalink/421097438495399/?sale_post_id=421097438495399

Alright fess up! Who bought this and is trying to flip it on FB for $28k!?

Thanks for that. Looks like that guy is local as he referenced Saddleback Cars. He pulled the rubber off the tank straps and had them blasted and painted. I think i'm going to do the same.