Order a 116, or even a 118 link chain and cut it to your exact needs.
That way, before you cut, you can put the 13t and the 14t on and make sure things will work out for you.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs