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Auto Throttle for Black Max 8100 Gen w/Honda GX390 engine

The wires to the auto throttle were cut at the factory. Do I need to reconnect or is there another wire I don't know about. No manual throttle control on unit. Honda GX390 VXG GCANK-1097829 engine.

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Posted on Jan 02, 2017

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SOURCE: Add auto idle to generator

Your genny should already have this feature as it is part of the function to maintain the output voltage, if it isnt working I would look for a service manual for it and taker it from there as there can be many things that could prevent it from working properly

Posted on Dec 31, 2008

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SOURCE: Automatic Engine Idle Control

RPM of the motor and the voltage hertz output of the alternator are directly connected. In this case the motor speed must be set on correct alternator output and locked on that speed. (Star & run on the spicific speed). Normally it would be 1 800 RPM = 110 volts = 60Hz, OR there are in some cases that RPM will be doubled that. It all depends on the make of the unit.

Posted on Feb 11, 2009

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Posted on Nov 02, 2009

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SOURCE: The wires to the auto throttle were cut at the

i have the same problem did you find a solution? anyone know what this is used for min has cut wire under carb and on the auto throttle it will only run with carb wide open i tired the two wires under carb and that just shuts fuel off or on with a needle with 12v applied.

Posted on Apr 06, 2010

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Honda EM5000SX generator - will not idle up when a load is placed on. Will produce power but will not idle up.


from your description and what you do , the problem is in the auto control unit
it will be in the system to reduce the rpm to idle when there is no load ( auto mains on off controller switching between genset and mains supply)
by turning the auto operation off you are committing the gen set to full rpms regardless of the power requirement
you have the option of having it fixed at an gen set repair shop or leaving it off and starting the genset only when you have a mains power outage
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My Honda EB3500X Shuts off when auto throttle is switched on making me run full throttle at all times. Cause? Solution?


if your engine shutting down, then your auto throttle is working.
when you hit the switch watch the throttle arm move on the carburetor to the idle position,if so you may have to clean the carburetor jet and fuel nozzle ports.possibly this occurs when unit has been stored for quite some time.once jets are cleaned it should maintain idle.

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Brand new gx390 Black Max generator backfires when shut down. Might this be plug gap problem?


If you can access throttle linkage to the carburetor, slow the engine speed to idle before turning off. As mentioned in the previous answer ... turning off the fuel valve and letting it run dry is good if you are not planning to use it real soon.

Aug 11, 2011 | Honda Electrical Supplies

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Engine won't idle. when it goes to idle motor


Throttle position sensor, check this out. Also try cleaning the throttle body with throttle body cleaner may be all it needs'

Feb 13, 2010 | Mitsubishi Diamante Cars & Trucks

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Unit starts with auto throttle off. engaging auto throttle shuts down unit. in past months, pluging in a cord would shut down unit. That is with no tool in use, just plugging into the receptacle.


Hi. There are 2 things that control the Auto Throttle and that is the idle control valve (Connected with black and yellow wires) and the Auto Throttle Unit.

Start Generator
Check for 12VDC on the Yellow wire of the idle control valve. Yellow is positive to any good Chassis ground. If you don't have 12VDC then either the Auto Throttle switch is bad or the Auto Throttle Unit iself.

You can gain access to the Auto throttle switch and again check for 12VDC to Ground on both sides of the switch with the switch on. (It may read as high as 13.8 engine running) If you don't get 12 - 13.8 VDC the the Auto throttle control unit is bad

If you have 12VDC to the Idle control Valve and it does not work perform a resistance check across the coil of the Idle control Valve (both wires disconnected Engine off) Black to yellow should read 3 to 4 Ohms If you have no resistance then the coil in the Idle control Valve is bad.

If you need more help just respond here

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Feb 09, 2010 | Honda 3000 Watt Portable Generator

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The wires to the auto throttle were cut at the


i have the same problem did you find a solution? anyone know what this is used for min has cut wire under carb and on the auto throttle it will only run with carb wide open i tired the two wires under carb and that just shuts fuel off or on with a needle with 12v applied.

Dec 01, 2009 | Coleman Electrical Supplies

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Where can I find an owners manual for a Black Max 8125/ Honda GX390 OHV generator? I searched Honda's site but not there, no black max site. My lawn guy pulled a wire off and I need to see where it is...


low oil sensor will not cause the motor not starting.
most likely is th ground wire.
you can try to attach that wire to any surface and try to start it. of it start, then you have to dis-assemble the head and find out where the wire should be attached.
if not, the wire is attached to a hot side. either way you have to dis-assemble the head.
http://www.honda-engines.com/engines_owners_manuals/ownersmanuals/gx390.htm
here is the site for the manual.

Apr 07, 2009 | Electrical Supplies

1 Answer

Automatic Engine Idle Control


RPM of the motor and the voltage hertz output of the alternator are directly connected. In this case the motor speed must be set on correct alternator output and locked on that speed. (Star & run on the spicific speed). Normally it would be 1 800 RPM = 110 volts = 60Hz, OR there are in some cases that RPM will be doubled that. It all depends on the make of the unit.

Jan 02, 2009 | Electrical Supplies

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