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Hey guys...
I have a Bolens 1250 with a Wisconsin S12D -- there are a few significant cracks (cylinder head) and a couple other oddities that make me think a repower might be more sensible than a rebuild.

It's only half apart so far but looks like the engine shaft comes out to power the hydrostatic transmission on one side and the belts on the other -- ??? Or am I crazy?

If this is so it might make sourcing a repower engine more difficult.
 

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Bolens 1886-01
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Welcome to the forum. Yes it is belt driven to the drive shaft and also belt driven to the pto. That 1250 is a large frame tractor, the 1st of the large frame Bolens. They are good rugged tractors but the old Wisconsin can be hard to find parts for. Others here have repowered those tractors. I am sure it can be done.
 

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There are several threads on this forum where guys have repowered with newer, more modern engines. Briggs Vanguards are popular for this. Do a search with 'repower' or 're-power' as key word, should get you started.
 

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The shaft in the front is a bolted-on stub shaft, not really a crankshaft that extends out both sides of the motor. Most of the horizontal engine makers sell various lengths and diameters of them.
As for engine swaps, there was a company selling repower kits with mounts, stub shaft, exhaust, etc. Should be out there in Google land somewhere.
 

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Small Engine Warehouse (in Indiana) sells a complete repower set-up for the earlier Large Frames like the 1250
 

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I ALSO HAVE A 1250 WITH THE S12-D ENGINE- and a couple 1455`s with the s14-d - just my opinion- i would either rebiuld your engine or find a s14-d which will fit right in their is one on e-bay right now on a generator- i resaerched some on the topic- not many kind words about small engine warehouse- you would have a couple grand in that thing by the time you got done if you bought the briggs v twin vangaurd- contact sams bolens- he probably has available engines you would send your`s in for a swap or he has a guy rebiulding for him now
 

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I repowered my 1477 with a Kohler K-341. Was fairly simple to do. Still running strong after 6 years. This one is by far my favorite tractor.
Why did you cut the hood like that? Still a nice look tractor.
 

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good morning, i had another engine in it for a very short time. It needed clearance, so i cut out the hood. probably a bad move now that i look back. i have the cut outs, next paint job i'll weld them back in.
 

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I pulled a running, but smoking, S12D out of my '67 1250 and replaced it with a 23 hp Vanguard. Pro's and con's both ways, but if I had to do it over again I would. I use mine with a front loader and box scraper. I don't mow or till with it. The complete S12D is still sitting in my garage, new points, rebuilt carb and starter generator, it has plenty of power but smokes a fair amount. I would post it for sale but the shipping would be insane.
 

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I pulled a running, but smoking, S12D out of my '67 1250 and replaced it with a 23 hp Vanguard. Pro's and con's both ways, but if I had to do it over again I would. I use mine with a front loader and box scraper. I don't mow or till with it. The complete S12D is still sitting in my garage, new points, rebuilt carb and starter generator, it has plenty of power but smokes a fair amount. I would post it for sale but the shipping would be insane.
What would the asking price be?
 

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I would have to do a little research, I would assume it's worth more parted out, but then there's the hassle factor. You may have a better idea what the value is than I do, off the top of my head I would need $300-$500 to even consider boxing up for shipping, that may not be realistic. I would take $300 from some one locally just to save the hassle of shipping it.
 

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I would have to do a little research, I would assume it's worth more parted out, but then there's the hassle factor. You may have a better idea what the value is than I do, off the top of my head I would need $300-$500 to even consider boxing up for shipping, that may not be realistic. I would take $300 from some one locally just to save the hassle of shipping it.
Ok thanks. I will not pursue it any further.
 
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