Question about Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model
Runs fine low or high speed at idle with clutch/break pedal down, but when released in gear or neutral engine runs rough and backfires. Changed plugs, oil/filter, fuel filter, air filter, cleaned deck, drained and replaced gas. Still runs rough.
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Posted on Jan 02, 2017
It may think you are in reverse and is killing the motor to keep you from backing up with the blade running. Look for switch that is telling it when you are in reverse, maybe it is stuck with grass or other debris. another possibility is that the blades are jammed and they are stalliing the motor. Mines stalls easily when cold.
Posted on Mar 12, 2009
Under the seat, there is a operator presence switch, if this switch fails, the mower will shut off when the brake is released, or put in any gear.
Posted on Apr 23, 2009
There is an operator presence switch under the seat...it is more than likely faulty and must be replaced in order for the mower to run right.
Posted on May 03, 2009
Sounds too lean.
Can you cover the air intake with your hand 90% or use the choke a bit and then load the engine to see if it runs better?
If you ever find a carb with manual high and low mixture adjustments that will fit yours......put it on and keep it on.
You can usually get then from older tractors.
Posted on Aug 25, 2009
I had the same problem. If it is a 2 cylinder, remove the valve covers. On one side, the rocker arm had slipped off of the push rod. It was real loose. Put the rocker arm back on the push rod and tighten it down. I think this will do the trick.
Posted on Sep 01, 2009
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