I looked into the carbie whilst the engine was running rough and there was petrol gushing up from the bowl past the needle... I thought then "oh, that's a lot"
BECAUSE everytime I got them home I thought I'd do the right thing and clean the carbies (the engines ran when I purchased them, the owners started the engines in front of me). That's what I couldn't understand.
The key thing was, I'd see a bronze cylinder (maybe 8mm long) on the floor/work bench when I was cleaning up after the carbie strip/clean. Couldn't figure out where it come from. I had 2 of them sitting on my computer table for months, just in case they were important. Finally, I watched some videos on youtube and one guy stripped down a carbie and I could see these same bronze cylinders. I felt like I won the lottery!!! In this carbie there are 3 components in the metering process (not including the needle): the main jet (which has a number on it), the needle jet holder and the main jet (this is the 8mm cylinder). Youtube guy said you usually find these main jets on the floor afterwards ROFFL. They usually fall out when you're not looking and you don't know about them.
One rear tire is flat so cannot go far, just around the suburban back yard but it's good to see the engine running