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No luck getting the 1250 running


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#1 accidentalchild OFFLINE  

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Posted March 03, 2016 - 03:52 PM

So I have yet to have any success getting this s12d running. I have cleaned up suspect wires,changed fluids,plug,air filter, etc. when I put a voltmeter up to the plug it showed I am getting like 5 volts. I went through the carb as well. Hooked a brand new battery up. Put a new starter generator on it. It's a slug and it hisses or has some type of air sound to it when I turn it over. I looked at the points and they look clean. It acts as if it doesn't have spark and the engine does not turn over very fast, I checked the tent ion in the belt. When I have had the engine turn over faster it still doesn't try to start. It seems like a spark or fuel issue but I haven't been able to get it started with fluid either. Do I not have enough voltage or do I need to check compression or what?
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#2 accidentalchild OFFLINE  

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Posted March 03, 2016 - 03:56 PM

Here is a picture or two.

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#3 bolens4life OFFLINE  

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Posted March 03, 2016 - 04:00 PM

So you probably already tested for this, but in the gas tank of my 1250, there is a screen or a bowl to filter out debris from making its way to the carb. Was blocking just enough fuel to keep it from starting

Drove me crazy until I figured it out. Just an idea if you run out of options

Good luck
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#4 crittersf1 OFFLINE  

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Posted March 03, 2016 - 04:10 PM

Stuck valve?


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#5 Bolens 1000 ONLINE  

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Posted March 03, 2016 - 04:11 PM

Take the plug out and spray a little carb cleaner then see if it starts , if you get nothing you have something other than a fuel issue going on.


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#6 accidentalchild OFFLINE  

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Posted March 03, 2016 - 04:12 PM

Yea I cleaned up the tank and such and put a new fuel filter on it. How do I go about checking for a stuck valve. This engine is barely turning over hooked up to my flood charger for a jump.
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#7 accidentalchild OFFLINE  

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Posted March 03, 2016 - 04:14 PM

Take the plug out and spray a little carb cleaner then see if it starts , if you get nothing you have something other than a fuel issue going on.

yup I have done that it seems like the engine itself isn't turning over very fast.
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#8 Bolens 1000 ONLINE  

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Posted March 03, 2016 - 04:16 PM

Try it the old school way and disconnect the starter belt and rope start it, Its been a while since I seen the 1250 starter pulley in person but they should have the notch for rope start.


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#9 accidentalchild OFFLINE  

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Posted March 03, 2016 - 04:19 PM

Ok so I took the spark plug out and it turns over like no body's business. Spark plug in the engine hardly turns over.
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#10 Chubien ONLINE  

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Posted March 03, 2016 - 04:23 PM

Slow cranking is not uncommon with these starter generators. You say you hear a hissing sound when cranking, are you sure it's the starter and not a blown head gasket?
My 850 would not start until I changed the head gasket it was just loosing too much compression.
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#11 accidentalchild OFFLINE  

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Posted March 03, 2016 - 04:27 PM

Slow cranking is not uncommon with these starter generators. You say you hear a hissing sound when cranking, are you sure it's the starter and not a blown head gasket?
My 850 would not start until I changed the head gasket it was just loosing too much compression.

I am not sure at this point I can also hear air coming out of the exhaust. How should I check the head gasket in this?
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#12 1967bolens collector OFFLINE  

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Posted March 03, 2016 - 04:29 PM

If they put a smaller pulley on the yen I see it's a double bc of the pump for the loader that will make it turn slow. As ur cranking it over have the plug out an stick ur finger in the plug hole if it don't blow ur finger out then the exhaust valve is stuck
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#13 accidentalchild OFFLINE  

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Posted March 03, 2016 - 04:29 PM

Sounds like the air is coming from the top middle of the engine on the gas tank side.
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#14 accidentalchild OFFLINE  

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Posted March 03, 2016 - 04:33 PM

If they put a smaller pulley on the yen I see it's a double bc of the pump for the loader that will make it turn slow. As ur cranking it over have the plug out an stick ur finger in the plug hole if it don't blow ur finger out then the exhaust valve is stuck

it did both want to blow my finger out and suck it in. Also the hissing is coming from the spark plug hole when it is seated. It is not sealing.

#15 accidentalchild OFFLINE  

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Posted March 03, 2016 - 04:39 PM

The spark plug hole looks like it was threaded twice? Like a thread cert. It is not sealing when I tighten the plug.

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