Yz 125 Power Valve Failure, What Went Wrong?

Back with the yz125 project. After tearing into the power valves I noticed that one of the pins popped out. After inspecting the pins they looked very worn and damaged, watch till the end of this video to find out what I did and also for a little quick fix on a coolant problem.
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[@user-sk4ym6id4h]

if u would've use them nuts at the end for the head it would've had a coolant leak, i had a 125 do this to me not sure if it was something different

[@amfk8079]

Go get 5/32 roll pins. perfect replacment