I can't remember what size without measuring, but I just got a length of silicone radiator hose the size of the smaller diameter pipe and slid it in. Zip tie either side, happy days!
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear
2016 RM-Z450
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