Recently my small 3cyl yanmar in my jd garden tractor started to give out a faint grey smoke. If you let it idle for a few minutes and then gave it full throttle it would give out a large plume for a few seconds then mostly clear up. It’s annoying as it always is giving a diesel smell around me when mowing. It has 1300 hours on it. It always starts right up even in the cold. This smoking has happened recently before it always ran clear. I decided to take the injectors out today and found one of the injectors was wet and the other two were dry. Could this be my issue? Does this indicate a leaking injector?