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I bought a 2017 yxz1000r 3 pedal with a broken first gear. So I pulled the trans and found the first gear completely broken in half which put a hole in the case. I got the hole welded and new gears, which ever ones were broken. Then I got it back in and it drove perfect for probably 2 miles. Then I drove it on the trailer backed down and put it in first and when I started driving it had the worst clunking sound like it broke teeth off! Only in first. Anyone know why it would be doing this? Just breaking first gear.
 

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Did you check all the shafts for straightness and bearings for excessive play? Maybe a bent shaft or damaged bearing is causing excessive binding and breaking the gear. I think I might be looking for a decent used tranny at this point.... Good luck.
 
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2019 YXZ SS SE
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Sounds like a bent shaft.
 
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