Originally Posted by Diesel911

OK the Service Manual does not say what size the wire is. But, it gives the size of the tiny central hole in the Pintel. You will need to use a Wire that is undersized or it will indeed stick in the hole and sometimes break off.

The origional Nozzles had a 0.15mm Central Hole
In Nov of 1981 the hole size was changed to 0.20mm

Also where I worked between 1975-1980 we used Carburator Dip to loosen the Carbon on Injectors and Turbo Chargers. I do not know if the newer less toxic stuff they make now will do the same thing.

A Ultrasonic Tank could also work with some chemical cleaner.

On eBay they have some ads for K&S ENGINEERING wire.

In both cases it would work better if the central Hole was cleaned out with the Wire first so that the Chemicals could actually get inside.