Dom,
If it wasn't 300 below zero outside, I'd be in the shop. Anyway.....this is regarding the SD-40.
First, as you know they are pretty rare, but still out there. I was able to find a blue plate from Land Cruiser Specialties.
Anyway I bought two rebuild kits (glad I did). I screwed something up (may not have been my fault).
Here is mine (currently off the vehicle awaiting a fix)
Now, they are very simplistic and easy to build. Might I point out one thing here.
I rebuilt mine, it was super fun and easy. I plopped it on and when gas pumped through it, the rig fired right up.
I drove it for a couple of days and an issue developed. When I would step on the gas, it would stumble.
I checked everything, I pulled the top off, inside and out everything looked ok.
I have a D-40 carb that I rebuilt as well (from late 60's cruisers) and plopped that on there and took the SD-40 off.
After close inspection......here is what happened. You know the new accelerator plunger?
This thing:
Well, there is a groove that you will see that goes between the plunger hole and the carb bowl.
Keep in mind, I followed all the rules, soaked the plunger in oil, etc... (DON'T forget to do that).
If you don't adjust that plunger properly, the seal (leather part, or rubber depending on your rebuild kits contents) will catch on that groove.
What is the result? One of two things. Either 1, it will bend the "C" clip that clips onto the bottom of the carb and operates (pulls down) on the plunger. When bent, it will not (if at all) pull down the plunger to give you that squirt of gas as you first push the pedal. Or 2, the clip will come off all together.
On the SD-40's the upper part of the clip just sits in the hole, the bottom has a little clip on it.
I used a TINY drill bit and a cotter pin to secure it to the top as well, but in my case, the plunger caught on that groove and bent my clip:
You can see on the bottom how that "C" had been spread out, giving me the stumbling on acceleration issue. You can also kinda see how I secured it on the top. I guess in this case, better bent than missing.
Anyhow, check this out when you go to build your carb, and ensure you have the plunger setup correctly.
-Dallas