Just as I was finishing up today, putting the final cleaning and adjustment touches to the old 320, I notice that one of these hollow brass "grub screws" was much looser than usual. I don't know what they do, I can't work it out from the manual, so I left them alone. However, this one was so loose, it broke off.
OK, I have a few spare so I managed to carefully remove the threaded end from inside what I imagine is the emulsion tube? I also adjusted the the throttle slide and needle to the "correct" length as per the manual. In hindsight, I probably shouldn't have. That's introduced a variable where I didn't really want one!
I fitting everything back as it should be, and it kinda ran. Popped the air filter back on and no dice. She'll start on Start Ya Bastard and kinda run, but fuel is pouring out of these hollow brass grub screws. Fuel off, packed it away. Done for today.
According to the manual, I have enriched the mix by setting the throttle needle shorter. But it has been set at the appropriate length protruding from the throttle slide, and I had to take it apart to see what the length of the actual needle is, as that dictates the correct setting. Nothing else was touched. Before, when depressing the tickler, you might get a drop coming out the tube, and that was the giveaway to stop and start the mower.
I can only guess that they are "fuel compensation tubes." That is mentioned in the manual for cold starting, but it doesn't really go into detail as to what they actually do. There is just an arrow and letter pointing in the vague direction of something on the carby. It can't be much else, but I'm not sure. I assume they're for adjusting the air/fuel ratio, but I can't be sure of that either!
Any advice from the Carby Kings would be appreciated! She is so close to being "100%!"
If it helps, the "overview" photo of the carby has the air flowing from left, mixing in the carby and exiting right. In the photo showing the inner workings, the air flows from RIGHT and moving into the engine to the LEFT.
I don't collect mowers. I just require Multiple Mowing Solutions™.
