Motorcycle Questions? Ask a Mechanic.
Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, let's check / review the basics. Proposed preliminary tries (if have not been done):
Yes. "...leak/hole in the main needle valve diaphragm..." would be a cause of the bogging down but I was under the impressions that "...disassembled the carbuerator, but did not find anything that may be causing the problem..."
...and what is the burn color of the spark plug?
None that I know of; only visual check.
Sorry but need info on the burn color of the ceramic tip where the electrode fires.
Bear with me and re-check the air box /filter. Is it the original?
"...replaced the Ignition Control Module....", why please? ...same reason?
Is this bogging down a sudden / recent issue? ...slowly developing over time? ...ever since had it/used it?
Would you consider an experiment? ...the spark plug color is good but can you make the mix a little richer?
Appreciate the additional information and very significant:
With the battery fully charged and each & every part in their places including the air box & filter, temporarily disconnect the voltage regulator for test purposes and run the Honda under load.
IF, then yes.
Interesting; "...no voltage regulator..."
Please upload and post back with a link to your copy / version of the service manual.
And yes please, an update when conveniently able.
"...With the battery fully charged and each & every part in their places including the air box & filter, temporarily disconnect the voltage regulator for test purposes and run the Honda under load...."