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My 1990 Honda Super Cub has a problem that seems to occur mostly after it gets wet. Sitting in neutral, if I slowly open the gas it will reach full revs easily, but if I twist straight to full throttle it will lose power and even stall.

It's an intermittent issue anyway, so it's hard to say, but I think it tends to go away when the engine warms up.

This answer suggests that this is a fairly well-known carburettor problem. What is that problem? The carb looks like the newest part of the bike, and a mechanic recently claimed to have cleaned it.

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    Welcome to Motor Vehicle Maintenance & Repair! If the carb has been cleaned recently, then it seems it wasn't tuned correctly upon re-installation. I'd take it back to your mechanic and ask them to finish the job. This to me is a problem with the accelerator circuit in the carb. If it's not squirting out enough fuel during enrichment, it will do exactly what you are describing. Commented Dec 29, 2018 at 13:31
  • OK. Looks like I need to read up on carb tuning! My mechanic doesn't seem to want to fix anything that ain't completely broke (and doesn't speak English) so I think this one's up to me. Thanks! Edit: I asked him to change the oil the other day and he took a sample and shook his head to say "your oil does not need changing" :D
    – Brendan
    Commented Dec 31, 2018 at 9:10

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