Just a thought but how about going with a belt configuration like a cvt (constant variable transmission) you could possibly rob one off a snowmobile. I myself would not consider the size 40 chain unless it was double roller. Also are you mounting the sprocket in a stationary spot on the axle, one that doesnt move with the suspension. Does the axle have a mid bearing to keep it stable? It's been a long time since I've worked on a metro so I'm not sure.
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