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Bolens 1886-01 Running Hot


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#1 bprzyw OFFLINE  

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Posted May 13, 2014 - 11:16 AM

Does the 1886-01 run hot, or is it just me? Mine seems to run until it gets hot, then loss of power then shuts down. If I choke it, I can at least get it back to the garage. Got fuel in carb bowl flowing unrestricted, air flow unrestricted, coil cracked. So it could be bad spark. Getting a replacement coil. But is this the only thing that would cause it to shut down when running hot? 

Thanks

 



#2 boyscout862 ONLINE  

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Posted May 13, 2014 - 11:25 AM

Mouse nest? Fuel line collapsing when hot? Good Luck, Rick



#3 bprzyw OFFLINE  

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Posted May 13, 2014 - 11:31 AM

Nah, cleaned out the mice when I pressure washed it a month ago. fuel line newer.... I did not think of that... Thanks will check that out.



#4 Husky OFFLINE  

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Posted May 13, 2014 - 11:34 AM

Do you have the top engine heat shroud in place? Also, your coil may be breaking down when it gets hot. Mine did that, hairline fracture that you could not see and when it got hot it opened enough to short out. Here is a picture of the upper heat shroud I am talking about. I suggest getting one if you don't have it. It pushes the heat out and away from the engine instead of trapping it under the hood.

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#5 Bud W OFFLINE  

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Posted May 13, 2014 - 11:38 AM

It sounds like fuel restriction / starvation, you said it will run with the choke on, It may have a bad pump or the supply line is restricted. My 1886-01 had set for years in a barn somewhere and the mice got in the blower housing and took up residence. When the engine started, it blew all of the stuff out and around the cylinders. I took the cylinder tins off and used a broke off hacksaw blade to clean all of the rust and grass from between the fins and that fixed it. In addition to air flow around the cylinders and fuel flow there could also be the ignition timing on the K482.


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#6 boyscout862 ONLINE  

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Posted May 13, 2014 - 11:41 AM

The voice of experience: it takes less than a week for them to build a nest and plug the cooling fins. Good Luck, Rick


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#7 bprzyw OFFLINE  

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Posted May 13, 2014 - 11:43 AM

Husky, I do not have the top heat shield.

 

Bud, yep, mine was like that. cleaned it all up.



#8 bprzyw OFFLINE  

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Posted May 13, 2014 - 11:44 AM

dang little varmits!!!!



#9 bread320i OFFLINE  

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Posted May 13, 2014 - 12:35 PM

Are you running the original mechanical fuel pump? These are common to quit when hot, then work fine once cooled off.

 

Next time it quits, check for fuel flow


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#10 LPBolens OFFLINE  

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Posted May 13, 2014 - 08:41 PM

...........there could also be the ignition timing on the K482.


The Kohler twins are very sensitive to ignition timing, and will run hot if that is off. The problem is usually caused by worn points, which changes the points dwell, which then affects timing. Remember the old saw "Dwell affects timing but timing doesn't affect dwell. Of course, dwell is another way of expressing the points gap when fully open and how long they are open in degrees of rotation. The proper points gap is 0.020". A cracked coil doesn't help, so it is good that you are replacing that.

#11 bread320i OFFLINE  

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Posted May 13, 2014 - 09:51 PM

Timing on the K482 can be checked and confirmed with a timing light through the sight hole on the top of the shroud.



#12 bprzyw OFFLINE  

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Posted May 14, 2014 - 07:31 AM

Thanks guys, will replace points, I forgot this had points. Been sooo long since I worked on something with points...........Have to check the fuel pump, do not know its mechanical or what.



#13 Husky OFFLINE  

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Posted May 14, 2014 - 11:18 AM

You should think about getting that top heat shroud in place. I may know someone who has some brand new ones for sale at a reasonable price.



#14 bprzyw OFFLINE  

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Posted May 14, 2014 - 11:54 AM

$60?



#15 bprzyw OFFLINE  

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Posted May 14, 2014 - 11:57 AM

I've got the front, both sides, and the rear. need top.






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