While the weather was bad, I decided to try and reduce the amount of smoke that the engine was producing. This seems to have got worse since I changed the cylinder head, and so it seemed like a good idea to start with the fuel injectors. I had some spare ones, so I dismantled them and cleaned the parts. I managed to assemble 5 good ones out of the eight spares I had. Today I finished putting them back in the engine, with new sealing washers. I’m glad to say that the smoke is much reduced once the engine is warmed up, and it idles more smoothly too.