5 Hp B&S Rototiller Won't Start - Tractors & Mowers - DIY Chatroom Home Improvement Forum

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Old 12-09-2012, 08:37 PM   #1
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5 hp B&S rototiller won't start

I know the gas is good because I used it the day before it stopped running. I tried squirting engine started down the carb and into the cylinder head. Normally in the past it would try to start. I checked the spark plug for a spark and noticed that it was giving a weak spark. I cleaned the magneto and the place it contact on the flywheel and then reset the gap using a business card. I then check the plug for a spark. The spark was still weak. I'm beginning to wonder if the magneto is bad, or if there is another contact like a ground that needs to be cleaned. A new magneto costs about $50 and so I'm not looking forward to replace it. Any ideas?


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Old 12-20-2012, 06:08 PM   #2
Central State Mower,LLC
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Although somewhat rare, I've had experiences in the past where a spark plug would fire weakly when removed and grounded to the engine block. When the spark plug was re-installed, the plug would not fire under compression.

If you haven't already done so, replace the spark plug...

Mark P.
Central State Mower, LLC


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Old 12-20-2012, 06:17 PM   #3
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Can you post the numbers off the cowling?

If it was built before about '82 it may have points. They can get dirty and a bad condenser can cause a weak spark.
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