Tuesday, 5 January 2016

Yamaha YBR 125 cylinder head / spark plug thread repair


Need to repair my threads for spark plug on this SL 125 engine but thought it might be useful for YBR owners too  . i use these V-coil versions



Buy these here 





Heli coil set 



drill out old threads 



I grease a bolts and fish out all the drilling bits and burrs 



Now tap out the whole 


again grease end to catch any cuttings 



i then blow out hole 



now fit the thread 





and break off the fitting tab 



fit spark plug tighten and test 


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