Xmotos CRT 250 (165FMM) sprocket fitment????

[NathanTC]

OK so im wanting a 10 mph increase to my top CRUISE SPEED, not top speed. So 55mph to 65mph. Currently the bike is 62mph maxed out on rpm. Gets there just fine with no signs of being underexposed. Recently added a better carb and deleted the egr system. So now it has even better power than it did stock.

Bike has a 13t-42t sprocket set and i know its either a 520 or a 530 chain. Gotta double check before ordering sprockets. Im planning on a 15t-40t set up and 0-ring chain.

My main question is this.
Who else has a bike with this engine, and had went to a 15t sprocket in the front? Does it fit?

Below are some photos that may help. The one of the front sprocket looks closer to the engine case than it really is. Its close bit the photo makes it look worse.