My 656 gas has a miss/stutter/roughness under high speed load. Today I was disking and it was very noticeable.
If I slow down to half throttle, it goes away. Under fast throttle with no load or a light load it runs just fine.
I'm not getting any black smoke out of the exhaust. It's almost as if it is running lean. This is the IH carburetor with the fuel solenoid shutoff, so I can't do anything to increase the main mixture.
Tractor had new points, plugs, etc. last fall. When I was hauling grain last fall I didn't notice anything.
Could a wrong type of spark plug cause this? The plugs I put in last fall were part of an ignition tune-up kit I got from the local farm supply store.
I've double checked the fuel line strainer and fuel tank sediment bowl. Air filter replaced last fall.
My Farmall M had symptoms like this once. It was caused by the valve clearance being tight. I took the rocker cover off on the 656 but valve clearance was ok.
Any advice on what to look for next? Thanks!
If I slow down to half throttle, it goes away. Under fast throttle with no load or a light load it runs just fine.
I'm not getting any black smoke out of the exhaust. It's almost as if it is running lean. This is the IH carburetor with the fuel solenoid shutoff, so I can't do anything to increase the main mixture.
Tractor had new points, plugs, etc. last fall. When I was hauling grain last fall I didn't notice anything.
Could a wrong type of spark plug cause this? The plugs I put in last fall were part of an ignition tune-up kit I got from the local farm supply store.
I've double checked the fuel line strainer and fuel tank sediment bowl. Air filter replaced last fall.
My Farmall M had symptoms like this once. It was caused by the valve clearance being tight. I took the rocker cover off on the 656 but valve clearance was ok.
Any advice on what to look for next? Thanks!
