I needed something different. Yamaha V-Max 1200 with turbo. I think we called it V-boost. Almost off'd myself on a bridge in Destin,FL when I hit somewhere between 145-155. Stopped looking when I got that front fork wobble.
I moved on to the current moto, a Yamaha TW 200. It's not fast, but I was able to find that front end death wobble at 70'ish while downhill with the wind at my back.
The "V Boost" on the Yamaha V-Max was not a "turbo". It was an extra butterfly in the intake manifold.
With a typical 7% speedo error, 145 mph indicated would be about 135 mph actual, which is about the top of third gear on some Sport-Touring motorcycles.
And unless there is something wrong with your motorcycles, the fork wobble that you keep encountering on them, is caused by you holding onto the handlebars too tightly. It can be made even worse, by sitting up in the airstream at higher speeds and/or locking your elbows.
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