You're not filling it to the top are you? They need a bit of air in the rads to allow room for expansion. I fill mine to the top, it boils once, finds its level, then it doesn't boil again.
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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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