Here's a breakdown of the work done for anyone interested.
Hitachi ISO x2
1- Carburetters fully stripped to component parts including complete disassembly of all linkages.
2 - Degreased before being ultrasonically cleaned and assessed.
3 - carburetters then sandblasted using my own formula grit which externally light and gives an Original Finnish.
4 - carburetters then again examined and assessed before a final ultrasonic clean in fresh fluid.
5 - carburetters sent to the engineer to have throttles upgraded with custom throttle roller bearings.
6 - All metal parts Zinc gold plated.
7 - carburetters assembled using new parts.
8 - new parts including - new throttle spindles with custom roller bearings, new main jets, new metering needles (SM), needles valves, float chamber rubbers, seals and gaskets as required, all missing/damaged parts replaced or repaired.
9 - tested for leaks and correct function.
Inlet manifold -
Inlet manifold was found to have several missing damaged parts and water chambers restricted with corrosion.
1 - stripped and assessed.
2 - degreased and cleaned.
3 - time taken to remove and clean corrosion before vapour blasting.
4 - All metal parts Zinc gold plated.
5 - damaged water pipe extracted.
6 - Assembled using new parts, and replacing USA spec cross chamber with U.K. spec cross chamber (supplied by yourself).
7 - New parts include, main water pipe, special sealing nuts and o rings, new water flow pipes manufactured/replaced (only one was available so second one was manufactured).
8 - heat shield cleaned and painted with heat resistant paint.
Carburetters installed onto inlet manifold and set to Datum/Factory settings.
Here's a link to the drilling out for roller bearings: