XS400 Helicoil

[dwain61]

I need to do a helicoil on my 79 XS400. Does anyone know what size i need?? The sparkplug size is NGK BP7ES.

[randy]

14MM

[dwain61]

Thanks Randy

[John]

Go to your local auto parts store and ask for HeliCoil part number 5334-14. That is the kit that I used to repair a bad spark plug hole. The thread size is M14x1.25, btw.

[dwain61]

Thanks Guys. One more question, is it a good idea to use thread sealer on helicoils??

[John]

The Helicoil kit that I mentioned recommends using a little of the orange, hi temp silicone on the outside of the insert, then let it cure before using. It's all in the instructions.