Dick from Canada
Generator trips out on over speed  instantly when doing it's weekly check . All other functions work fine . I have 123/ 246 volts , 61Hz at no load or very little load [ fridge , freezer] . Will start and run on manual ,start and run on loss of power to the distribution panel . Checked the vent on the gas regulator as this has given grief before with spiders getting in . Battery voltage is good at 14.1 . Wire from the  spark coil to the controller  is good and all grounds have been checked . A new starter  was installed last year [Would not turn over the motor,checked with a DC amp meter and found to be drawing to much current] Also a new spark coil due to a weak spark 
  
 Have reset the timer by removing the 7.5 amp fuse  and runs fine during the timer reset but the problem persist on it's weekly self check routine 
Any help would be greatly appreciated
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78buckshot
Welcome to the forum Dick, you say it trips instantly, does that mean it starts and runs then trips or does it mean that when the exercise time initiates the call for start it trips before it cranks? I would re-set the ignition magneto gap or replace the mag again, if that won't correct the problem then I would replace the control board. I did not research the unit, does it have a mechanical governor or electronic with stepper motor?
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Dick from Canada
It cranks and  ,starts and then trips on the over speed alarm . I have the service manual for this model and it states that once the control board sees a signal from the ignition coil the fuel valve opens and the engine starts . This works correctly but after about 2 seconds of run the over speed is initiated and shuts the unit down . This only happens on it's weekly self check . There is no stepper motor . The speed control is mechanical. [Think lawn motor I guess.] There is a choke controlled by the control board .  The manual does not say if the choke is temperature dependent . The manual does not go into detail on the over speed function only it's purpose.  I have checked the  speed control linkages an found no sticking or corrosion. Some generators have  a lower rpm on their self check routine but I do not think this is one as the speed control is not electronic. Will check the mag gap . I will get a monometer and check the fuel pressure up stream of the regulator . Are there any schematics around for the control boards?   Thanks for the help😃
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Peddler
Try rebooting the board by totally depowering it and then bring it back up.  If that doesn't work I would think control board.  Have you put a frequency meter on it to see if there is an overspeed?  Did you try backing off the gov. ?
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78buckshot
With the mechanical governor and your freq. reading of 61hz. it's either the mag or the board, good idea to check the fuel pressure but I don't think it will cause the overspeed unless it is extremely high and at that point it probably wouldn't start.
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Dick from Canada
 Did not back off the governor. Very reluctant to do so  Will totally depower the board  Friday and  will wait to see what happens  on it's next self check a week later. I think the shutdown event happens too fast to get an accurate frequency reading  A new mag on order . Not that much coin and an easy replacement,   Mag gap checked with a paper business card and it not off center and very close to magnet on the flywheel. 
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Wireform
Maybe your missing a wire somewhere. I've seen those molex connectors once in a while when you connect them back it pushes a pin back instead of mating therby lacking a connection. Then again I don't know this specific model.
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Dick from Canada
All connectors to the control board will be checked on Friday when I depower the board . Thanks for the tip
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Dick from Canada
Depowered and all connectors checked ok.  It's "brain" reset. Starts fine on it's weekly self check now . Problem is likely still there but will not attempt to look any further as it is working now . Just got tired I guess.  Thanks for your help. Thunderstorm season is coming  and may need it on and off. 
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78buckshot
As long as you can get it going in manual when an emergency arises it gives you a little time to make plans. Do you think the generator "just got tired" or is it you that is tired? I can help fix the generator but not so much on human issues.
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Dick from Canada
 We live in an area where there are several large users on the grid. Several oil refineries as well as chemical plants . Every once and a while one of them might shed it's entire load causing a significant surge on the grid .  [ lights up the night too with flaring ] This has caused problems with other appliances in this house as well as others who live in the village. Washing machines ,microwaves , clothes dryer timers.   The problems can be fixed by rebooting [ unplugging and restarting]the offending appliances.  I suspect that this may have been the problem all along . Every thing is back to normal . I am in the process of installing a surge protector on the main household panel.  Also the utility company is installing a new substation they say will correct a lot of these problems. Should have thought of this sooner . Ok I'm tired too 
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