[wilkin250r]

I have also tried revving the engine in neutral. And honestly, this test is inconclusive for me. The vibration is seen in the mirrors and heard through the chassis more than it is felt in the seats. With 4.10 gears and little tires on this old camper special, the 55-60mph of this vibration is getting up there in rpms. I haven't hooked up my tach, I'm just kinda ballparking it by engine whine, it's kinda hard to tell what is imbalance, and what is "this engine just isn't happy revving like this in neutral". Sometimes the vibration seems really bad, sometimes it doesn't. But definitely no rhythm, no boom/beat.

Plus, I live in a duplex, and I'm literally revving this engine nearly 3k, with free-flowing exhaust, less than 15ft from my neighbor's front door. I'm willing to do it a few times to try to figure out this problem, but I don't want to be TOO disrespectful.