There is also an o ring under the collar. You should replace that as well. Hopefully the crankcase gasket isn?t split between the engine and gearbox. That will be a full motor split.
You should look at the numbers on the needle and have a read through the thousands of jetting threads on here. If it is the stock N1ef needle throw it in the bin and source another different needle. NEDW works well as well as the N3EW series.
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Back on a gassy! 2018 EC300! 🤘
Txt 280 07 to make me feel like a gumby again
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