Husqvarna engine failure - Snowblower Forum : Snow Blower Forums
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post #1 of 29 Old 03-07-2019, 11:22 AM Thread Starter
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Husqvarna engine failure

Picked up a Husqvarna ST324p in excellent condition off FB marketplace for short money. I fully understood I was picking up a big box machine (my previous machine was a Toro PowerShift), but still figured it was worth a shot. It was tough to start and backfired, so I reset the valve lash. First snow storm, it ran great and threw well under load. Second storm, the issue returned - this time, I replaced the plug, cleaned the carb, and once again, gapped the valve lash. Next storm, ran great for about an hour, then started to sputter, backfire and eventually stop running. Any thoughts/suggestions ? It runs the 254cc Husqvarna branded engine.
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post #2 of 29 Old 03-07-2019, 11:34 AM
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If it has a partially sheared flywheel key, that could cause problems. Does adding choke help? Does it still have a good spark after it dies?

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Last edited by RedOctobyr; 03-07-2019 at 11:41 AM.
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post #3 of 29 Old 03-07-2019, 11:38 AM
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2 things it needs, spark and fuel. When it quit did it still have spark? Does it restart when it cools down?
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post #4 of 29 Old 03-07-2019, 11:55 AM
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Originally Posted by strtch5881 View Post
2 things it needs, spark and fuel. When it quit did it still have spark? Does it restart when it cools down?
3 things actually. Air, fuel, spark.

If itís runs for a period of time then dies, but will restart cold... itís likely the ignition coil.

Run the machine until it dies then check for spark.

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post #5 of 29 Old 03-07-2019, 01:07 PM
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With some of the blowers running LCT engines that have the rocker switch for a shut off, you may want to look at the area where the wires connect to the switch as there were problems with the position of the lower tab to connect the wire and if it was not bent down out of the way, it allowed for that wire to contact the linkage and ground out killing the engine, and it would do it erratically as the linkage would move and let it ground and then not ground.

There was a TSB from LTC on this exact problem.

It sounds exactly as the problem you have encountered. Hope it helps.
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post #6 of 29 Old 03-07-2019, 01:39 PM
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Originally Posted by drmerdp View Post
3 things actually. Air, fuel, spark.

If itís runs for a period of time then dies, but will restart cold... itís likely the ignition coil.

Run the machine until it dies then check for spark.
You Forgot Timing
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post #7 of 29 Old 03-07-2019, 03:39 PM
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Quote:
Originally Posted by drmerdp View Post
3 things actually. Air, fuel, spark.

If itís runs for a period of time then dies, but will restart cold... itís likely the ignition coil.

Run the machine until it dies then check for spark.
Technically, fuel is air and gasoline together.
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post #8 of 29 Old 03-07-2019, 04:27 PM
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Quote:
Originally Posted by drmerdp View Post
3 things actually. Air, fuel, spark.

If it’s runs for a period of time then dies, but will restart cold... it’s likely the ignition coil.

Run the machine until it dies then check for spark.
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You Forgot Timing
You forgot compression
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post #9 of 29 Old 03-08-2019, 03:22 AM
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Quote:
Originally Posted by Skids View Post
It was tough to start and backfired, so I reset the valve lash. First snow storm, it ran great and threw well under load. Second storm, the issue returned - this time, I replaced the plug, cleaned the carb, and once again, gapped the valve lash.
You adjusted the valve clearance twice. Was it out of spec the 2nd time around?

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post #10 of 29 Old 03-12-2019, 06:26 PM Thread Starter
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Just feeling well enough to get back to this - the valves did seem a bit out, SnowH8ter, but I thought it was negligible. Nonetheless, I re set them. I just now tried to start it, and as before, I pull it several times, it sputters, seems like it wants to start, then BANG ! A very loud backfire.
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