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The optima originally had a lightweight chain and when the turbo optima was released it had a heavier duty chain which was available as a hop up for all optima series platforms that used chain for its drive, the pitch of the heavy duty chain was identical but it was made from heavier guage wire, unless you have the two side by side it's hard to tell which is which.
It was supposed to be less likely to stretch under the extra power the buggies were being subjected to especially when run on 8.4v as the turbo optima and salute were designed to do.

I didn't know about the Turbo/Salute's chain being any different, but I still think the same issue of the chain stretching, existed. Converting to the belt drive resolved that.

I'm not sure what your question is, though?

Stephen Lander wrote:The optima originally had a lightweight chain and when the turbo optima was released it had a heavier duty chain which was available as a hop up for all optima series platforms that used chain for its drive, the pitch of the heavy duty chain was identical but it was made from heavier guage wire, unless you have the two side by side it's hard to tell which is which.
It was supposed to be less likely to stretch under the extra power the buggies were being subjected to especially when run on 8.4v as the turbo optima and salute were designed to do.

You have a Kyosho part number for that chain, or was it just a rolling change?