+1 on what pugs has said, I put belt tensioners on mine when I first built it just because I was chucking hop-ups at it as they came out rather than because they were needed but in the end - and I can't remember why, it was 3 years ago - I took them out. I run a 6.5 brushless in it and have never had a belt jump. Dusted the old girl off after a 2 year sleep for a club night last night and she went round pretty good.
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