<VV> plug thread inserts

[Frank DuVal]

Glad it worked out.

All the "Helicoil" type inserts have the same threads per inch, as they 
have the same threads per inch on their outer surface as the inner 
surface the spark plug screws into. This is because the inside is the 
same wire as the outside.

The solid style insets, like KD, can have any outside thread per inch 
specs the manufacturer wants, as the inside and outside are removed from 
each other by the solid wall. The inside TPI must still match a 14mm 
spark plug thread.

I like the K-D style as the hole does not need anymore enlarging (no 
drilling) and can be done on the side of the road. Just grease the tap. 
The leftover aluminum chips seem to blow out the exhaust on startup.

Using the same style insert was the best way to go.

The idea of a shop vac blowing is great for shop installed inserts. I'll 
file this idea away for later.

Frank DuVal

Doug Mackintosh wrote:

> 
> 
>One person suggested that the various insert repairs all share the same thread in the head, but I found that the K-D insert (which I think is the same as Clarks C3212) has a smaller diameter and different thread pitch. 
> 
>Based on that, I decided to get the Sav-A-Thread kit and insert and install it properly. 
>