Question about Craftsman 4 Cycle Blower/Vac

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Got a craftsman leaf blower cranks up and runs fine for about 5 mins then starts losing rpms

Craftsman leaf blower 4cycle cranks but after 5 mins starts losing rpms and dies out

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ITs hard to diagnose these things over the internet, it could be so many things.
Is this a gradual loss of power? If so; Im sorry to say; that it sounds like its losing compression as it warms up. It is not cost effective to repair the unit.

If the loss of power is more sudden it could be a failing ignition module. Ive even seen spark plugs that quit working when they get hot.

To test this you will need a proper spark tester, laying the spark plug against the head will not provide an accurate assesment, and a can of carb cleaner. Run the unit with the air box cover and filter removed till it fails and immediately give a shot of carb cleaner in the carb and restart. If it starts right up it could be fuel related. IF it doesnt start right up then quickly test for spark. If no spark then its likely the ignition module. If it wont run on the extra fuel and it has spark then it has probably lost compression.

Posted on Nov 12, 2012

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