Was running a vampire v2 6.5 in mine but encountered problems with the sensor unit slipping and altering the timing on its own. Eventually replaced it with a nosram pure2 modified 6.5 and really liking the design of the timing inserts. It runs a bit hotter than the vampire did but it feels quicker too. Also interested to hear about others opinions on motor options for another yz-2 I'm putting together.
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