Yep, this reminds me of the RD400 motor I converted to alky. This was before you could just go buy a set of alky carbs. I made a main jet flow tester. I put roughly double flow amount mains in it, huge pilots, and chucked the needles in my electric drill and sanded them down. I mixed up a batch of alky, poured it in and started it in my garage. Sniff, sniff, AWESOME! I'm blipping the throttle, warming it up and all of a sudden the thing starts screaming at about 6000 RPM. I hit the kill switch. Still screaming, CRAP! I gotta yank the plug wires off. I'm probably gonna get the shock of a lifetime, but I gotta save my motor. I yank the plug wires off and it's still screaming. WTF???? I'm panicking. How do I shut this thing off before it blows? In desperation, I wing the throttle, and obviously the rush of cold air cools down the plugs and it dies. I will never forget the panic and confusion of this thing screaming with no plug wires on it.