Re: QD-10 that runs horrible. Expert advice needed.

[larkbill]

The best clue you gave was the high speed adjustment not having any effect. I think either the nozzle gasket is missing or leaking, or your float level is way too low. I worked on a 15 hp for a friend that acted similar to yours and found the float installed upside down. The fuel level in the bowl was only about 30% of what it should be. I have and run a QD-10 so I’m aware it shares no parts with the later motors but I think the carb design is similar enough.