Engine intek 21 hp , poping back through intake

bobed63

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May 19, 2017
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intek 21 hp popping back through intake and building pressure in crankcase. but will hold 175 psi when checked compression
 

NorthBama

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May 28, 2014
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have you adjusted the valves
 

TobyU

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Jun 1, 2014
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Twin or single? I thought 20.5 was biggest single but not sure.
Either rocker arm stud loose and/or bent push rod, on twin-push rods bent / jumped off rockers-possibly caused by slipped valve guide from over heating, or popped out intake valve seat.
I just had to pull one off mower and take crankcase apart to remove bent pushrod ingested inside after it slipped exhaust valve guide bent pushrod and jumped off rockers-possibly then found its way into block.
 

JonnyBlaze

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May 6, 2017
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Broken flywheel keyway?
 
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