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Kohler Generators

1951 Kohler 350M21 350 Watt Generator Set #154768


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  #21  
Old 05-22-2017, 11:39:29 PM
turtmaster turtmaster is offline
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

after cleaning the crank case out with gas, id probably run rotella 15-w40 in it, along with a bit of MMO (marvel mystery oil) to help clean it out, along with a bit of running the engine with a few short oci's.

very cute little gen, wish i had one, good luck.
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  #22  
Old 05-24-2017, 08:04:06 PM
Vanman Vanman is offline
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

So, because I just LOVE to experiment, I am currently running my WHOLE house on this little Kohler. It's running this computer, which is playing music, as well as a couple of lamps and the telco equipment.

When I first switched off the main, the meter was showing a 30 watt load (mainly just the telco equipment), but when I threw the load on the generator, evidently the refrigerator wanted to defrost. It worked, almost full load though.

When it came time to start the compressor- the main experiment- that was a no go. The engine didn't lug, the generator just doesn't have the electromagnetic cajones. Too bad. My 800 watt Kohler, driven by a B&S Model B, starts up the 8 kbtu/hr window A/C as though it was on the mains. Then again, you don't just pick up that set with one hand lol.

Here are a couple of blurry photos of the metering equipment in the hall. Need to figure out how the governor is adjusted on this engine. Frequency was around 58 cycles, no load, 54 - 55 on load.

Keith
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  #23  
Old 07-16-2017, 04:41:00 PM
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

I would love to find one of these for myself
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  #24  
Old 07-16-2017, 05:32:58 PM
Vanman Vanman is offline
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

There has been one on fleabay for a LONG time, for crazy money. $600!

I would imagine that it is still there. If you're lucky enough, it may be close enough that you can drive over to it and strike up a somewhat reasonable deal, in person.

I'll see if I can find it again.

Well, evidently it's gone, even from the completed listings. I hadn't been "watching" it, so I don't know if it sold, or he gave up.

Here's a 1000 watt Kohler Automatic. Doesn't have the cuteness factor though.
http://www.ebay.com/itm/162566338733

And here's one that I *really* want. An 800 watt Kohler Automatic. This is powered by a Briggs Model B. Again, at ~250 lbs, is lacking the cuteness factor.
http://www.ebay.com/itm/253037375543

Keith

Last edited by Vanman; 07-16-2017 at 05:44:47 PM. Reason: Ad links
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  #25  
Old 09-02-2017, 07:13:04 PM
Vanman Vanman is offline
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

Since I had left ~1/3 of a tank of fuel in this set after I ran it last time, in May, I decided that I needed to use it up, before it went bad.

It ran right about one hour on that little bit of fuel, the longest I have run it yet. And I'll tell you what *everything* on this thing gets HOT when run for an extended period!

I used it to run a fan and some lights in the bedroom, and charge my phone. Later I ran my computer monitor, speakers, and desk lamp with it.

But I also performed another experiment- starting and running a 1/4 hp motor on it! It's quite amusing, but also illustrates just what is possible, when the conditions are right, in this case no load on the motor. Full load current for the motor is 5 amperes, and full load current for the generator is 3 amperes, so it's really quite remarkable to be able to get it started.

https://youtu.be/8HgkZA1wwB0

Here's an old film of the motor itself, including what it sounds like when started across the line- comes up to speed a wee bit faster.

https://www.youtube.com/watch?v=yjeq8ddBeyY
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Old 08-07-2018, 12:39:28 PM
sbbloom69 sbbloom69 is offline
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

I know this is a year-old post, but I just noticed that you resurrected a Kohler 350M21 genset. I have three of them. All of mine came from a defunct Civil Defense fallout shelter. They all have the same Kohler K7 3.5/4.0hp engine and a 110VAC 350 watt "alternator". I actually found a real manual for this set, except that the carburetors on mine are Carter v.s. Tillotson. You may have figured out that the governor control is "backwards" compared to a similar BS. These little gensets are fixed with voltage regulation. Nominally, it's 110V at 60hz. So far, the best I've response I've gotten is 121V and 62 hz unloaded, and 59hz and 109V fully loaded. Good enough for 1951 lights and emergency radios. I'm going to try and find the manual and scan it to the site (I may have already). If you search for Kohler 350M21 you will find my posts from 2014.
Stuart
Los Alamos, NM
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  #27  
Old 08-07-2018, 02:20:29 PM
Vanman Vanman is offline
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

Hi Stuart, nice collection!

Keith
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  #28  
Old 08-07-2018, 10:49:38 PM
s100 s100 is offline
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Default Re: 1951 Kohler 350M21 350 Watt Generator Set #154768

Vanman,

If those little engines are like the bigger ones (I think K11) then there is an adjusting screw with a lock nut somewhere on the carburetor side of the engine to adjust the governor. It's been years since I looked at mine but that is what I recall. I can't tell you if turning IN or OUT makes the engine run faster but it's easy enough to find out. I used the K11 a couple of times during two of our numerous power outrages and at I think 850 W it ran the fridge and the deep freeze quite well, and simultaneously although I don't think I would want to load it much more. That said it chugged happily (and economically) away for hours at a time. Since mine had the automatic load sensing start/stop feature I suppose I could have set it up and walked away but I never tried that. The carburetor (Carter N) was badly worn and finally the engine flooded and gave up the ghost (temporarily). I put it away and while I have carburetor kits now for the N's I just have not gotten back to it.

sbbloom69, those engines are not 3.5/4.0HP. They are 3/4HP. They are only 1800 rpm and no one would use even a 3HP engine on a 300W machine. Since 746W = 1 HP then 300 watts is just about right for a 3/4HP engine.

I kick myself regularly when I see people posting cool stuff here, because at one time or another in the past I did not avail myself of opportunities to buy similar things. These little gensets are a good example. A few years ago someone had one on craigslist for I think $40. It looked nice and was complete but the ad said the tank was full of crud and syrup. But it was winter and it was cold outside, the genset was probably 20 miles away, the seller got my nose out of joint when he said someone could use it for a "mini bike motor" and he would not take my top offer of $25. For $40 I could have had the set but I chose not to bite. Given the same opportunity today I would probably spring for the $40, mini bike insanity or not. But then I have lots of junk already, and nearly all of it is clamoring for some sort of attention.

When can we expect to see the opening of "Van Man's Prehistoric Light Plant Museum?" Might almost be worth the drive or better yet AMTRAK from Detroit!
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  #29  
Old 09-20-2018, 10:47:53 PM
Vanman Vanman is offline
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Default Re: 1951 Kohler 350M21 350 Watt Generator Set #154768

As it happens, I have a need for this little set, so I've been working on it a bit.

When I got it, it's air cleaner was improperly installed and broken. In the meantime I bought another air cleaner, but it didn't have the right "look". Much more recently I bought a little air cleaner for my Briggs WM.

I got to looking at all of the air cleaners and hatched a plan to use the upper part from the Kohler and the lower part from the Briggs.

It required some adaptation but no modification, so I can still use the Briggs air cleaner on the Briggs. The inner tubes were different sizes, so the copper tube serves as a sleeve to make up the difference. The bottom of the Briggs cup is supported and sealed with a fender washer and a neoprene washer. I even got a fiber washer to go under the wing nut.
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Last edited by Vanman; 09-20-2018 at 11:08:22 PM.
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  #30  
Old 09-22-2018, 02:27:37 PM
Vanman Vanman is offline
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Default Re: 1951 Kohler 350M21 350 Watt Generator Set #154768

I was thinking that the generator looked a little dirty inside, so I thought I probably ought to pull it apart and clean it out before running for any extended period. Good thing I did!

Will get after it with some compressed air a little later on today.
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