Harry,
   The FACT is that you've just demonstrated that Usenet advice may be
worth exactly what you pay for it - as your fact 1 isn't relevant, facts 2
and 3 are completely false, and fact 4 may or may not apply - but since it's
an emissions carb, isn't as easy as you would like to make it seem.

How many rv generators have you worked on? Or, more specifically, how many
Onan Microquiets have you worked on?

Alan

harris@thehilltopcafe.notagoodaddy (Harry Harris) wrote:
.....  

....

Since you're already yelling and cussing, I guess foaming at the mouth
is next.  Before you start....

It may NOT be possible / remotely simple for him to 'take the carb apart
and clean it'.. a lot of recent (past 10-15 yrs?) small Onans have carbs
that are designed to be replaced, not rebuilt.

I know this was true on my '99, '01 and '06 2.8 Microlites, which are
basically scaled-down clones of the 4.0 Microquiet.  Dunno if it's for
emissions reasons, or to make 'em cheaper to manufacture.

For the OP... Both of my earlier ones were varnished by PO's neglect.
They responded quite well to a Seafoam / Techron / gasoline
(~1/3  each)  mix fed thru the fuel filter, but it was over days, not
hours.  Ran them for just a minute each day to get fresh solvent into
the carb passages, for about a week.  They both ran fine after that.

If your stalling was caused by the microwave being on when the A/C
compressor cycled on, it's probably simply overloaded.  Likewise if you
tried to restart the A/C too soon; it can take three minutes or so after
the compressor cycles off for the head pressure to drop to 'acceptable'
levels.  
   
They will stall when overloaded.  They labor briefly, then die.  At a
guess, it's due to the voltage supply to the ignition dropping below
some threshold value for the electronics to work.

Jim, "Entropy never sleeps; do y'all?"

It has both electric and gas. I have tested the systems and the
generator will run everything in the trailer with the exception of the
Microwave or AC. However, I did test the batteries and both failed
heavy load testing. In my manual, that situation would have the
battery charger operating at 1000 watts all the time, thus running the
micro and ac would overload the system. I am going to replace the
batteries, re-test and see where I am. If that doesn't work I am going
to have the loads measured as you have suggested. I would also like to
say to all others on this board, your help has be vaulable as well.
However each and every thing that Alan has had me do thought this
process has lead to a positive result. I would use his advice without
question..... Thanks again for your help Alan. Ken