I had one, they had reamed out the port into the combustion chamber, as they were indirect injection, the idea being that a bit of diesel would get on top of the pot, I don't know if that is what happened, but mine was on the button.There was, and still is a good few 4cyls about here, some where total pigs to start but the clients that owned them wouldn't have been easy got going either, any that was well looked about, eg terminals, battery's, heater plugs, earths etc seemed to do ok, some as I said before got faster starter and there was something else that was done to the head , to lower the compression I think that left them easier started to, they did piles of work, people had to work with what they had.