Modern Vespa

.[/quote]Unless the engine stalls in front of oncoming traffic... The problem with carb bikes is that if you crack the throttle when they are cold, you can stall them out.[/quote]

On My Royal Enfield Himalayan 2018 carb model I don't find that. Even on cold -4C morning on my commute to work from non-insulated garage, I get on it, roll it out the garage, pull choke and start the bike (always starts first time) while I make sure the auto garage door closes properly while putting on my gloves, probably takes less than 10 seconds and ride off. Just accelerate gently at first. Push choke in about 1.5kms from home at my first traffic light stop. At this stage the engine is still a bit cold as the idle is at 1000rpm and does slowly rise to 1250rpm at the lights. Now this is as simple an engine as it gets, CV carb (Keihin knockoff) air/oil cooled 2-valve motor. Never dies even when using throttle when cold. A proper set-up carb engine does not need warmup first. The choke should keep it running if the engine is very cold.

That's been my experience with Enfields too. And they are fantastically reliable I found.

Interesting thread. I always let mine idle for a bit after starting as if I twist the throttle right after starting, it always dies. I start it and don't touch anything for a minute or two to let it warm up in order for it to run properly. It has always been that way for me. The Vespa GT200 I had was the same way.

Unless the engine stalls in front of oncoming traffic... The problem with carb bikes is that if you crack the throttle when they are cold, you can stall them out.[/quote]

On My Royal Enfield Himalayan 2018 carb model I don't find that. Even on cold -4C morning on my commute to work from non-insulated garage, I get on it, roll it out the garage, pull choke and start the bike (always starts first time) while I make sure the auto garage door closes properly while putting on my gloves, probably takes less than 10 seconds and ride off. Just accelerate gently at first. Push choke in about 1.5kms from home at my first traffic light stop. At this stage the engine is still a bit cold as the idle is at 1000rpm and does slowly rise to 1250rpm at the lights. Now this is as simple an engine as it gets, CV carb (Keihin knockoff) air/oil cooled 2-valve motor. Never dies even when using throttle when cold. A proper set-up carb engine does not need warmup first. The choke should keep it running if the engine is very cold.[/quote]What an excellent description of how you ride one particular bike, with a manual choke, to work where you live. Are you under the impression that all bikes ever made with carbs run like that? Or that yours will continue to run like that without further adjustment down the road? And nowhere in your detailed description of how you ride to work did you mention cracking the throttle wide open to get out of the way in an emergency situation. It sounds like you slowly warm up the bike, albeit while moving. That's not the same as holding it wide open thirty seconds after the bike starts running.