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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