Wemoto in the uk sell a pattern version. They seem slightly tougher than the Yam ones, but the best fix is still packing them with bits of inner tube.

Chain just needs to be set like that. It does tighten up under compression.

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I spent a lot of money on travel and racing motorcycles - the rest I just squandered.

XT660Z - Commuter, Adventurer...Racer?

www.dashmoto.net

Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400