Generator problems

Hello:
I have a question regarding my Northstar 8000 Watt generator (with 13 HP Honda GX390). Recently we had to use this generator extensively and during that time, the generator quit on us as if we hit the kill switch on it. Now, I cannot get it to run more than about 5 minutes with any load on it (even something as small as a fridge and freezer). Without a load, it seems to run fine without any problems. I've already taken it to the nearest Honda dealer which replaced the Low Oil Sensor switch. However it is still doing the same thing after I got it back. The last test I did was hook up an air compressor to it. The air compressor motor tried to kick on, however the motor only turned over a couple times and quit, and the generator shut off at that exact moment as if I hit the kill switch. I did this test 3 times and got the same result.
Does anybody have any ideas or suggestions on what could be the issue with this thing? I will be calling Northern Tool to see what the next step is, but I wanted to see if this group may have more ideas. This is pretty frustrating.
I appreciate any and all feedback.
Best, -- Chris
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How many various safety features are there on the unit that can kill the engine? Is there a way to bypass each one at a time? What is the relationship between any sort of safety shutdown feature and the generator itself? Is there something that would shut down the engine if a short or groundfault is (erroneously) detected?
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Those are the questions I was asking myself, too. I have seem some previous posters that owned Northstar generators so I was hoping somebody out there knew a little more about them, as info on them is very limited. The only obvious things that can kill the engine are the Off switch and the Low Oil Sensor switch, the manual mentions them both. I have no idea but I'm assuming this must have some other sort of kill mechanism, I have looked it over and I can't visibly identify one. There aren't any wires running from the generator head (or electric output box) to the engine that I can see.
Thanks much in advance for any further ideas that anybody can provide!
Thank you, -- Chris
Steve Kraus wrote:

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Also try bypassing the low oil switch, and possibly the on off switch. But the 5 minutes under load might be the ingition failing when it gets hot.
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m Ransley wrote:

I will try bypassing the Low Oil Sensor and will post the results.
I don't think it's the ignition failing, as it will start right back up just after it stops, every time. Although I was told by the Honda service center that when the engine quit, it was because of no spark (which is why they replaced the Low Oil Sensor).
Thanks.
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You say it runs without a load but 5 minutes with one, could it be dying from lack of fuel under load such as a partialy stuck float not getting it fuel. Or could the electronic ignition module be failing when it gets hot, Ive had several motors run fine till they got hot and the ignition module was to blame, See if you get spark after it dies, if yes see if Either or gas squirted in the carb gets it going.
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szilagyic wrote:

It seems that I have found the solution to this problem after a lot of testing; the Low Oil Sensor seems to be the cause. I got it to shut itself off several times in a row, then immediately unplugged the sensor (the single yellow wire coming from the engine block) and it ran for another hour under different loads without a single problem. I am really surprised as the Honda service center just replaced the sensor. I don't know of any other reasons that the sensor would detect low oil, I'm using 10W-30 as suggested by the manual and it is topped off at the correct mark. One thing I noticed after the engine ran for a while is the oil had some small air bubbles at the top near the fill hole... but I'm assuming this is normal.
Thanks again for all feedback on this issue. Hopefully the suggestions in this thread will help others in the future with similar problems.
-- Chris
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