I didn't run it far at all, just enough to set the trim etc, and accelerating slowly which avoided the noise. I've got a couple years experience but never with a Losi drivetrain, if I got the same noise on cars I have run before I'd definitely say it's belt slip or chewing the spur, but I'd already checked the belt tension and the spur/pinion mesh is not too bad, I was just wondering if belt slip is usual on a brand new old version X5 if the mods (such as the additional tensioner) had not been done?
Haven't rebuilt it because I'm going to do the X5 squared upgrade anyway soon!
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