Ok, so I've got another question about my 53 model d4 7u. When I bought it about a month ago, it would crank but smoked gray smoke at startup and while running except at full throttle. At full throttle the smoking would stop and seemed very smooth. Well after running it a little, it still smokes but I did notice that cracking the #2 injector would make it smooth out and no smoke. My book says to change out that injector nozzle to clear that up - I did. Seems harder to crank now, smokes probably more than it did, and pops a good bit even at full throttle. I didnt ever drain the fuel out and figure theres water in there but what's up with it smoking and making more racket now? I'm not a full blown mechanic and hope this is not a hard fix if anyone can help with advice? Thanks!