Chris,

I dug this out of my files........I've also heard of some guys using JB weld to attach the brass tubing to the cover.


Here are the pics for the diaphragm mod. Not hard to do.....

1. Remove cover from carb.

2. You may need to drill out the hole a bit larger. I made my hole just a bit smaller than the tubing. That way you can just set the tubing on top of the cover and solder. I believe I also cut like a 30 degree angle on the tubing to help get the angle I needed. Also on one of my carbs the original hole was on the edge of the cover. I filled this one with solder and drilled a new one in the center. Just seemed like it would be easier to solder the tubing on that way.....

3. Use a dremel cut off wheel to ruff up the metal a bit. Clean well with alcohol.

4. Bend brass tubing. You can use 1/8" or 3/16".

5. I used the Butane torch you see in the pic. Works real well. I just used regular electrical solder. You can use silver solder if you like. Add some flux to it before soldering if you have it. If not, there is probably enough flux in the solder to do the job. Just make sure everything is clean. Wouldn't hurt to take some steel wool to the end of the tubing your soldering also....Clean afterwards.. You can see how I used a small vise & holder to make the soldering easier.

6. After you solder the brass tubing on, be sure the inside of the cover is smooth. Any burrs will poke a hole in the diaphragm.

For some reason I can't get the pictures uploaded. [:@] I'll keep trying.