97 YZ80 cutting out

My son's yz80 idles fine, rev's up fine, but he says that when he's out on the 30 acres going across small bumps it tends to cut out. He says it only happens when it starts bouncing. He says once it starts cutting out it has a hard time getting going again. He says it's fine when he rides it down our street. Any ideas would be greatly appreciated. Thanks.

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