Aftermarket parts
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Never really found a great one website for aftermarket parts, however sips scootershop seem to have a wide range of carbs they sell. That's where i got my tmx30 from. Wemoto sell alot of bike parts, however they're mostly things like consumables but they do have some nice things like reeds and all. eBay is great place for exhausts and little parts
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For things like plastics, you're in luck. A chap called Filpe on eBay sells replica plastics. Naturally never as good as Genuines but a very good price that you can't complain at. Lots of forum members have bought from him in the past. So well worth checking out. He's from Portgual but does ship to UK.