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  1. Air Cooled Twins Technical Talk
    The problem. At high revs (70 mph in 5th) the bike hits a flat spot. No more power and feels like fuel starvation. Starts well, idles well, minimal if any popping on deceleration. The history: Has had NFRU (US market) pipes for 17 years. No other mods to fuel/engine except last week when 115s...
  2. Classic, Vintage & Veteran
    Just started doing it over the weekend, I first thought maybe I had some bad gas or something but I filled up with fresh 90 ethanol free and doesn’t seem to matter. Happens in all gears right around 3500 rpm, almost feels like it’s out of gas or missing a cylinder. Could it be something to do...