2012 WR over heating issues

I apologize if this is already been posted but here goes..... Purchased this bike last year and so far it's been great. I've recently started to ride some technical single track with my buddies (mainly first....second gear if I'm lucky) and the bike starts to boil over, especially when I'm feathering the hell out the clutch which I usually am. My friend is telling me I need to purchase a radiator fan and wire directly to the battery(KTM Is the only radiator fan I've been able to find). However, I went to my local shop and the guys are saying that if I change the front sprocket it should resolve the issue...

The bike thrives when I'm riding with my wife on double track and high mountain passes, but I know I'm getting a lot more air intake.

Any advice is appreciated. Bike is still completely stock

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