Why do I keep breaking rocker arms?

Slugfarm said

Mine sound slower, heavier, lumpier. Where yours clops, mine clatters. Is this making sense?

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Yes that tells yours idles slower. Mine produces that idle at "around" 900-950 RPM. It does not like to idle "much" below that without protest, but it will. I simply prefer it right where it is. Do you have a video if it running?