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Broken intake valve rocker

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Sebrof29

46 J3,2006 Legend Cub
Supporting Member
Joined
Sep 22, 2015
Messages
90
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Location
L70 airport
Have a C65 Cub took off about 400 ft engine lost power did a 180 back to runaway. Discover broken rocker at the intake valve end. What could possibly cause a broken rocker? Lots of oil present and rocker shaft moved freely. Rocker had a oiling hole.
 

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