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Starter motor can't turn engine through compression stroke

MTD yard machine ride -on mower . 18.5 hp/42 inch Briggs & straton motor : ''Starter motor ( new ) can not turn the piston through the compression stroke . Even when I connect jumper cables directly to the starter motor terminals. Valves are opening and closing in correct stroke . Spark plug new , gets wet from fuel . Removed flywheel , all timming magnets good . Replaced flywheel in correct place as shaft has a key.
Initially the mower started and ran ,but I removed the brake for the blades (worn ) and ran the machine. When switched off the key the engine would backfire as the momentum of the blades still turned the engine.

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  • Yard Machines Master
  • 872 Answers

Valves are out of adjustment. reset them and it will do fine.

Posted on Apr 08, 2017

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6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Stalling Briggs & Stratton engine

Try taking the air filter off ,start the motor and try it. If this works replace air cleaner element

Posted on Oct 05, 2008

  • 106 Answers

SOURCE: My riding mower blows fuses once you turn the key.

Sounds like you are on the right path, maybe some wires on the ignition were replaced backward, and you are sending +12v directly to ground? Does it blow right away?

Posted on Jun 04, 2009

lester482529
  • 226 Answers

SOURCE: lt1000 17 hp . problem: starter will not turn

sounds like you have a ignition switch problem.same happened to me had to replace the switch.hope this help's.

Posted on Jul 11, 2009

lester482529
  • 226 Answers

SOURCE: MTD lawn tractor. 16 hp twin briggs straton

THIS SOUNDS LIKE A THROTTLE CABLE LINKAGE PROBLEM.WITH THE HOOD OPEN AND MOTOR RUNNING RUN YOUR THOTTLE UP AND DOWN WHILE LOOKING @ THE LEFT SIDE OF THE MOTOR TO SEE IF THE CABLE IS FROZEN IN PLACE OR BROKE OR DISCONNECTED .HOPE THIS HELPS

Posted on Jul 16, 2009

nova2nv
  • 197 Answers

SOURCE: I have a briggs and strattan 18 horsepower engine

Set intake valves @ .004 and exhuats @ .006 with piston a 1/4 inch downstroke from TDC.It sounds like the ACR {automatic compression release}is not working do to valves having to much lash.

Posted on Nov 18, 2009

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