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I'm not sure about a broken valve spring and certainly not a bent pushrod. I was literally cruising down the interstate at 75 MPH (~3,000 RPM) when the symptoms popped up. I hadn't had the engine over 3,500 RPM all night. The motor only has 600 miles on it and I've put the last 200 on it. I'm fairly certain the person who put the first 400 on it didn't abuse it, nor have I. That's why I'm now leaning more towards a clogged jet on that half of the Weber carb that feeds the rear two cylinders. If I clear the Weber as the culprit, then I'll start considering engine internals.
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