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Wisconsin S-D12 problem

bolens 1250

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#1 fogler12538 OFFLINE  

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Posted June 25, 2016 - 11:45 AM

My problem is it floods out on high idle or under load. I've replaced the carb with a nos carb, change fuel filter and anything else I could think of that had to do with fuel. After all that it still flooded out so I took it to a "professional" small engine guy. He had it for several months which was fine, I didn't have to store it for the winter. Got it back yesterday, no charge, it's still doing the same thing. Any ideas???????? I'm lost. Jim

#2 chieffan ONLINE  

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Posted June 25, 2016 - 01:08 PM

Hole in the float?  Float hanging up?  Just a couple things I have run into.  Good luck.


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#3 boyscout862 ONLINE  

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Posted June 25, 2016 - 01:24 PM

Since the usual seem to have been looked at, I'd suspect that the pump may be pushing too much pressure. Is a pressure release in the pump stuck? Good Luck, Rick
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#4 crittersf1 OFFLINE  

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Posted June 25, 2016 - 01:37 PM

May be trash in the needle/seat



#5 fogler12538 OFFLINE  

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Posted June 25, 2016 - 01:44 PM

carb is all new (NOS)

#6 fogler12538 OFFLINE  

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Posted June 25, 2016 - 01:47 PM

When you first started after cooling down it idles fine, high and low. Once I move it or engage PTO it floods out

#7 Bruce Dorsi OFFLINE  

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Posted June 26, 2016 - 08:54 AM

When you first started after cooling down it idles fine, high and low. Once I move it or engage PTO it floods out

 

How do you know it is "flooding out" and not an ignition failure?

 

Gas dripping from carb?  .....Sooty, black smoke from exhaust?

 

When it cuts out, is the sparkplug wet or dry?

 

Have you verified the presence of a strong spark right after the engine cuts out?


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#8 fogler12538 OFFLINE  

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Posted June 26, 2016 - 09:30 AM

wet plug and it backfires when shut down
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#9 Bruce Dorsi OFFLINE  

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Posted June 26, 2016 - 08:11 PM

wet plug and it backfires when shut down

 

I've heard of a lean mixture causing a backfire, but I've never heard of a backfire being caused by a too-rich mixture.

 

Backfiring through the carb is usually caused by an intake valve not seating properly, or improper ignition timing.

 

Backfiring through the exhaust is usually caused by an exhaust valve not seating properly or improper ignition timing.

 

The wet plug can be caused by flooding, or by faulty ignition (loss of spark).

 

Wisconsin engines are very sensitive to ignition timing, so setting points with feeler gauges is usually not good enough.

 

If you are losing spark, I'd start with a new condenser.  ....The points can be cleaned, reused, and reset unless pitted.

 

The best way to adjust the points is with a continuity tester or test light to get the timing correct.


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