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15 yz450 kicking back while starting

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My sons 15 yz450:will kick back while starting when it’s hot. Only mod is a FmF pipe. We bought it with only a couple of hours on it. It has about six on it now. He loves the bike but the kick back hurts his hip ( broke it while racing) We’ve raced both two and four strokes. This is kicking back far worst then any bike we’ve owned. Any ideas on how to lesson the chance of this happening .thanks for the help.

Edited by jim1234

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When it starts, does it idle high? granted most of my experience is from carbureted motorcycles and obviously on the four strokes and if you give it throttle while kicking it's going to kick you back so perhaps the idle speed is set too high giving it too much throttle and causing it to kick back on you.  I think these fi bikes can give you issue if you have your throttle position sensor off of adjustment.  I know this isn't a solution but it's just giving you some things to think about.  I hope it's helpful good luck

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