I have a lees sachs 4.2 that i can not get to run right.I have to heat a plug up in the tiller to even get it to start,after it starts it will not run long also does not run good.Can not move throttle much it will die.after a while it will not start,can take the plug out and put it in the tiller and start the tiller and let it run a couple of min. and then we put the plug back in the 4.2 and on and on and on......I have set the needles from 1 turn out to 3 turns out and it makes no difference?????I give,anybody got any advice?????...THANKS...Jerry