UNREAL UE4 - weld simulated bodies causes weird quakes after posses and attach, why? image attached

Hi, i created a pawn hover bike, and my character jumps and posses it… but, after posses and “attach to actor” if:

A) I click Weld simulated bodies, my character moves perfect while over the bike…but bike gets weird movements, like small quakes and it even moves forward without pressing any button.
B) if i uncheck "Weld simulated bodies, hoverbike mover perfect, without any quake or error, BUT my character stops moving and freezes while hoverbike moves, i attached my BP images,

Please check it and help