Harley Cart Only Goes in Reverse

Hello, iam in desperate need of some help. My 77 harley was working perfect until the air cleaner broke off & I ran it over, it's was kind of a jolt for the cart. Now it will only go in reverse, it won't go forward at all. Stills starts & runs great, goes like crazy backwards. I have little knowledge of these carts but I'm very mechanical, where do I start looking? Thank you very much!
 
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