hi i,m new hear but not new to this problem .i went through with my 125 ,i though it was my hydro ,even pulled it apart ,repalced bearings ,,placed it back ,and still same thing ,rolled the engine over by hand and heard a sound coming from the cam cover ,pulled cover ,and seen weight move on c/r tied a thread on spring ,and removed spring ,replaced with new spring .besure you leave thread on spring ,didn,t need spring going down the pan ,i used a needed noise ,and put engine back in place ,and first try ,it was running ,so hope this helps .David
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