Wits end

[bs175dths]

The simple fact that it occurs after it gets warmed up and then slowly gets worse as the engine gets hotter IS an indication it may be electronic degradation due to heat.

Heat creates resistance and the electrons slow down and the heat goes up.

So what electronic devices are needed to run the engine?
Pulse Generators
Coils
Fuel Pump
Fuel Pump Relay
all the electric connectors the electrons must pass through to get to those devices
and fuses

2015 - 1984 = 31 year old wire and plastic connectors (oxidation on the connectors pins can cause resistance) Throw in some heat and the resistance goes up.

Some suggestions I have:
document (in detail) what has already been done.
(Simply stating the carburetors have been rebuilt is too general a statement. These carburetors are complicated and there are four of them. What EXACTLY was done.)
don't ever assume the replacement parts are good or are still good. Electrons can destroy an electronic device in a matter of seconds.
it is tedious work, but, go over all the work and parts and make sure that isn't contributing to the problem

One very important rule to live by...... when you sense an increased level of aggravation/anxiety/getting ticked off/ having the urge to throw/kick/slug something...... put your toys away and walk away!

The cool thing about detailed documentation about what has been done is when you can't be working on the bike (or any project) you can take the documentation with you and you can 'think' about it while you are doing something else.

Systematic process of elimination is the ONLY way not to spend time chasing your tail.

so:
what does the bike do that it shouldn't be doing?
when does it do it?
what have you done to fix what it shouldn't be doing?
did what you did fix what it shouldn't be doing?
is it still doing it when it did it before the fix?

Throwing parts (and $$$) is easy, diagnosing is the difficult part.

Good Luck.
Take your time.
Eventually, it will run as it was designed......... like a HONDA.


- Ride On