I was disking with my 51 M yesterday and it was running fine and all the sudden it bogged down and would only run at an idle. It would shut off every time I tried to move or give it throttle. This happened once before and I replaced the points and it ran fine after that. So this time I cleaned the points and it seemed to straighten out but did the same thing again after a pass or two. I then replaced the points but it is still doing the same thing. I also pulled the plugs and they all were white like it was running lean so could this be a carb issue or should I work more with the ignition side? Thanks