How do you adjust a generator for high altitude?

Depending on what type of engine is on it, it could just be an adjustment or it may need a new jet, small engine dealers are prohibited from selling the tools needed to adjust the carb. If its removing and replacing the jet you can order the jet and remove and replace it yourself, if you intend to run it at lower altitudes keep the original jet as you will need to replace it to avoid damage to your engine.