Carbon and Carbon rings..

[Afy]

How do you get rid of them?

Dont seem to have an GM TEC in France.

Noticed that the patches tend to get tough to move at about 18 and 23 inches in the 27 inch barrel.
I do not have a borescope... and cant see anything obvious in the bore.

JB time?

 

[DRYHUMOR]

A decent engine repair shop may have a borescope, the correct diameter.

 

[Afy]

I checked around... no luck