"World Wide" also includes countries where ethanol is included in the fuel, and owners seem to be coping quite well. OK, unleaded is not as good as the old 4 star, but with a few adjustments doesn't cause too many problems. Using unleaded, I found my postwar Dougs tended to run a little on the weak side, so I've gone for one size smaller on the slide cutaway and an increase of 5 - 10 on the main jet - then drop the needle one notch to compensate. With these settings, the pickup from tickover is good and sustained full throttle gives a good colour reading on the plugs.
The problem of 'gummed up' jets will not go away by changing to another make of carb - it is caused by the extended idle periods between rides. I make a point of turning off the fuel after each run and letting the engine burn off the remaining fuel in the carbs, so that there is less to congeal in the float bowls and jets.
With regard to the choke slides - they never were much good, and are best ignored - with the carbs correctly set up, a couple of prods on the ticklers should give the necessary enrichment for reliable cold starts.
Eddie.
