hello herald. thats me finally got h50 engine back in and running.delays at engine refurb place !. runs good but when you rev it up under load it kicks out a lot of black smoke ,like its over fueling. tick over and half revs is fine and fairly clear ,just when you get up to full speed it starts to puff like a chimney. engine refurb place say they never touched the fuel side , they did rehone with new pistons ,head skimmed ,and new turbo. any suggestions. i reckon injectors are done but customer reckons he,s had them tested before it blew up. puzzler