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The following manual is only a guide to assist you and is not a complete or comprehensive manual of all aspects of maintaining and repairing your generator.
27 pages
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Question edited for clarity.
Question moved from Cars and Trucks to Generators.
Thar sort of information is never available especially on such a vintage machine, and you don't tell 'why'?
You would measure the diameter with an internal Vernier gauge or external on the male connector and then use a thread gauge for the thread pitch.
Or you buy a new tank or a new tap.
https://www.google.com/search?q=Scorpion+sc950+generator
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Question edited for spelling of 'carburetor'Please don't type in all CAPS, it is considered SHOUTING and is harder to read.Take the carb off and clean all the jets and passageways. Something is blocked and not enriching the mixture. Basically, the choke isn't working and you are doing it manually with the carb cleaner spray.Also do basic things like cleaning and gapping the spark plug...
Question edited for clarity, spelling (timeing) and toss in some CAPS.
Engine timing and Valve timing in the link.
https://www.google.com/search?q=Generac+389cc+Generator.+How+to+set+timing
You could also search for a Service Manual, but you will need the model number rather than the cubic capacity of the engine cylinder.
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GFCI and overcurrent protection (breaker) work in different ways. Suffice to say the GFCI is ~2000x more sensitive and trips long before the typical household breaker. So it's normal for a GFCI trip and the panel breaker to remain closed.The electrician is correct regarding GFCI devices. One GFCI device can protect multiple downstream outlets but some homeowners want a separate reset per floor or each bathroom to have its own reset, etc.As for the hair dryer... you're trying to eliminate trip sources so just leave it unplugged between uses and you'll get your answer.Typical trip sources are the GFCI itself (defect/damage/age) or an appliance of sorts. Then there's rodent or water infiltration issues. Anything you plug into the GFCI circuit is a potential trip source even something seemingly innocuous as a nightlight or air freshener, USB charger, anything that fits into the plug.
This manual is all I could find. Instructions and Parts List for Setting Up and Operating Millers Falls Langdon Acme Mitre Box, Langdon Mitre Box : Form No. M709 : Millers Falls Co. : Free Download, Borrow, and Streaming : Internet Archive
I also found a few results on the web for "miller and falls generator automatic transfer switch". One of the results is a 240V Automatic Transfer Switch by Millers Falls that can be used with GSD7500 & GSD9000 Series Diesel Generators . This switch can be wired directly to the house or workshop mains power fuse box. In Automatic mode, the switch will automatically start the generator if mains power fails for whatever reason. Once the generator is up to full speed and generating voltage at 50Hz, the switch will feed the power into the required load point. When mains power is restored, the ATS will transfer load from the generator back to mains power then shut down the generator. This same function can also be performed in manual mode if required. The wiring of the ATS must only be performed by a licensed electrician. The solenoid operating mechanism of the ATS ensures a high-speed transfer of loads between alternate sources of power, regardless of current draw. These ATS transfer boxes are available in 3 models to suit Millers Falls GSD7500 & GSD9000 (silenced & open frame) diesel generators, GSD13000 diesel generators (silenced & open frame), GSC12000i-Y & GST11000A petrol generators
