For cleaning your carbs/injectors I have been using Sea Foam for years.
It is made by Johnson Outboards for cleaning their gummy carbs.
The vintage cycle club I belong to turned me onto it and I've been
using it ever since. It does not hurt catalitic converters and can be
used in mowers, cars, bikes, just about everything. Pep Boys, NAPA,
and most auto parts stores has it. It's in a white can, and very reasonably
priced.