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Rick, I think you're on to something. I just read an article about troubleshooting the Weber 48 IDA. It said the idle circuit handles all operation up to ~3,000 RPM, after that, the main circuit takes over and the idle circuit is inoperative. The popping occurs from idle up to about 3,000 RPM and clears up, although I need to road test to confirm under load. The article said if that's the case (where the problem exists RPM-wise) start with the idle circuit. Looking at a schematic of the carb, it appears that the jets are in the bottom half of the carb. Is there anything I need to be aware of as I lift the top half off (e.g. surprise springs or loose items that can fall into the bore)?
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