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Variator rattling on Yamaha jog r 50cc?

When my Yamaha Jog r 50cc hits a certain speed a rattling comes from the variator, this is really annoying, and I'm sure it also makes it slower, as usually I get 40mph on flat, but ever since I noticed it, it's been doing more around 30mph. How do I fix this?!
Noah harwood, April 2012
sounds like rollers are shot. check the out. and replace if needed.

ray b, April 2012
link Click here to see other fixes for Yamaha.