A slight sticking was noticed when the throttle was moved to the full open position. Further investigation revealed that the nut and cotter key were catching on the fuel servo hose and had almost cut completely through the firesleeve. Rerouting the fuel servo hose prevented the interference.
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Hatz CB-1 Classic
It took 10 years for Hansueli and Samuel Gautschi to complete the ultimate do-it-yourself project, and the result is an absolute gem. By Ernst Bickmeier.

![Fuel Follies [Credit: Lisa Turner]](https://www.kitplanes.com/wp-content/uploads/2026/02/Fuel-Selector.jpg?w=218&h=150&crop=1)











