1. The CALIFORNIA air control board is what determined Tamper proof Onan carbs, NOT the EPA. California 25 years ago had strict requirements on small engines and since Onan could not just build APU's just for California, they made ALL their carbs California compliant.
2. When you rebuilt the carb, you DID remove the needle jet? That is the brass looking thin cylinder that has about 16 or 20 microscopic holes in that jet. If ANY of those holes get gummed up, the Carb and Genset will not run right. The ONLY way to clean that is to remove and clean out with Carb cleaner and compressed air. Doug
