2013 trx400x second gear issue?

Sup guys just got an issue picked up this 2013 trx400x for 750$. Yeah thats not a typo. got it running and second gear is acting up. Theres a rattling clunking type sound coming from the bottom end clutch cover side. Pull in the clutch lever it goes away. Itll go into second but makes a clunking sounds and it bucks a little. idling in neutral youll hear a clunk and chain will jump (barely) but enough to notice. 1st 3rd 4th 5th are all good, drained oil checked for shavings whole 9 yards. on uneven surfaces such as a trail itll take a second to get it into first, but i rode it all day pretty hard and didnt have an issue besides not using second. thinking shifter fork? just looking for advice and costs on average