I've had both. Can't tell any difference.
I did put the cast SmartCarb on my '18 250.
It is more compact and easier to install.
The optimum fuel mix ratio is 60:1.
I installed the Motion Pro T3 throttle cable on my '18 GG. It routes in the conventional manner, in front of the bars. Use part # 10-3000. 100% perfect fit.
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