Changing carbs

[Driftin Jon]

I've listened to everyone's advice and plan to change out the square tops on my '73 for round tops. I've gotten a set of round tops from E-bay, but I've got a few questions:

- I've got 4 screw round tops that appear to be in good shape. However, the knurled brass screw that goes ito the bottom of the carbs are missing. I'll check with the guy who sold them to me, but I'm not holding out for a favorable response. Can any type of proper bolt be put in place? Don't know exactly what the intention of this brass knurled knob is.

- The float bowls have the fuel inlet that's cocked at an angle, but what's the other fitting, just an overflow, and is that to be piped back into the air filter assembly?

- I did not get the linkage for between the 2 carbs. I assume I'll need it for those carbs and that my '72 linkage won't work from what I've read. ASny suggestions where to get the linkage?

- What else stays? The '73 has at least 4 different dashpots on the manifold and linkage. Don't know what stays and what goes. I know plenty of people have made this conversion, so it can't be that difficult, but is there access to photos or instructions available?

- I'm using the original N33 manifold. Probably should have just done it the easy way and bought an entire manifold/ carb/ air cleaner assembly. Too late now.

It gets pretty hot here in the summer - 115*F - so I'm assuming the tuna cans would not behave very well under those conditions. Any special recommendations, I'm all ears.

Thanks,

Driftin Jon

[seerex]

first i would recoomend going to z therapys website they have several pics that show the carbs taken apart and such a big help for me and no the bottom screw that is missing if its the one I think you are refering to is the richness setting , the center linkage can be purchased at the same site , and they sell a video on how refurbish them which I highly recommend, can't say on the n33 manifold I have several pics of mine just after I put my rebuilds on in my gallery but mine are 3 screws on a n36 with a euro balance tube, hope I helped some try the site it has great info

http://ztherapy.com/

good luck:geek:

[Driftin Jon]

I checked out your gallery and it does look like alot of the "junk" on the flat tops goes away. A couple of things from your gallery:

- Looks like your overflows are not tubed in. Should they go to the air cleaners? I've read a few other notes saying that if the floats stick, you could be dumping raw gas onto exhaust system.

- My choke cables come across my valve cover. I assume the routing doesn't matter as long as they end up in the right place.

- I don't think the knurled knob I'm talking about is for the mixture adjustment. In the Haynes repair manual figure 3.39 on page 56, it is referred to as the Jet adjustment limiter. The jet adjusting nut is on the bottom of the carb located on the centerline of the carb body. The knob I'm referring to is on the bottom of the carb right next to this adjusting knob.

- If anyone out there happens to have the Haynes manual, figure 3.33 shows the knob very well next to the jet adjusting nut. It sure looks like it just threads into the bottom of the carb body and doesn't mate up with anything else in the carb body.

Comments?

Thanks,

Jon

[seerex]

correct with my overflow , the factory aircleaner has two inlets for the overflow from the carbs, if the floats stick you will dump gas back into the aircleaner , or where ever you direct the overflow line to , somepeople use a msa can or windshield washer tank , not sure about the knob you refer to but I am sure ztherapy can get it

[mdixon]

I know of the knobs you are talking about. They are not required for the carbs to work. You probably need to rebuild those carbs anyway, and if not you will need to adjust them. If you don't know how to do any of this, I highly recomend you buy the SU video from Ztherapy. I believe the video is $15 and the re-build kit is $150 which includes the video.

These carbs are really easy to work on. Don't waste money paying someone else to do this for you. But make sure you do things right. As the other people posted, it is not a good thing to have gas drip on your exaust.

[Driftin Jon]

I've got things put in shape and am very satisfied with the overall performance and driveability. Just need to get some air filter adapters or an older air filter assembly.

Thanks,

Driftin John