Looking for opinions. I have a new to me '41 John Deere H, hand start. Starts fairly easy and idles well. When I get above 2/3s throttle it starts cutting out and sounds like it is missing bad. I may see a puff of black smoke every now and then. It doesn't matter if I am in gear or neutral. It will smooth out and run really well when there is a load on, say going up a big hill in 2nd or 3rd then start to sputter once you get back on level ground.
First thing I tried was new Autolite 3116 plugs. I noticed the old plugs were black which makes me thing it's a carburetor issue. I also cleaned and checked the point gap. I had several friends say that it sounds more like an ignition problem and I should try a condenser first. It has a Wico C magneto. I just replaced the condenser tonight and it made no difference at all. Does this sound like a carb or ignition problem?
What gets me is how smooth it runs up a hill wide open. Any ideas are welcomed and appreciated.
First thing I tried was new Autolite 3116 plugs. I noticed the old plugs were black which makes me thing it's a carburetor issue. I also cleaned and checked the point gap. I had several friends say that it sounds more like an ignition problem and I should try a condenser first. It has a Wico C magneto. I just replaced the condenser tonight and it made no difference at all. Does this sound like a carb or ignition problem?
What gets me is how smooth it runs up a hill wide open. Any ideas are welcomed and appreciated.