Posted by frysinger on September 08, 2020 at 10:40:52 from (134.126.76.185):
A couple weeks ago I couldn't resist a '41 9n for sale at a good price down the road. It started and ran at all engine speeds, but surged (especially under driving loads) and popped a bit. I bought it expecting to have to replace the governor, which I did. But while that helped, it still surges a bit. I read a thread here from early 2018 about this and tried all of the adjustments to the carb (which is a new TSX-241B the previous owner put on). It definitely acts and sounds lean, but I can't enrich the idle or main screws any more than I have. I checked the fuel screen into the carb (which seems quite a bit shorter than others I've seen), and secured the elbow joint (which seemed a little loose) to make sure no air was getting around it. I don't know how to check for a vacuum leak, but that's about all I can think of. Any tips on how to do that? Also, I saw somewhere (one person) that aftermarket carbs sometimes ship with an oversized jet that can let air in from about the bowl. Is that real?
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