Sounds like a bad glow plug in the .61....

as for the MDS....if it is fairly new you might want to check on a new crankcase or if it has a detatchable fron housing.....a new housing.....or.....you can use JB Weld or PC7 and weld it back on there......most of the time that works....

The only DUMB question is the one ya DON't ask....