I have a Mountfield mower (UK brand) with a small B&S Quattro motor - about 12 years old. It starts OK and then runs with a stutter, or "lumpy" as we say over here. I have:
a) Replaced the plug
b) Cleaned the air filter and re-oiled
c) Cleaned the carb and replaced the diaphragm and gasket (dang - I thought this would be the issue but apparently not)
d) Emptied the tank and replaced with fresh fuel
e) Topped up the oil
So what's left? Maybe the valves are sticky? If so, is there any way to fix them? If the remedy is to take the head off, any suggestions about where to find instructions for that?
a) Replaced the plug
b) Cleaned the air filter and re-oiled
c) Cleaned the carb and replaced the diaphragm and gasket (dang - I thought this would be the issue but apparently not)
d) Emptied the tank and replaced with fresh fuel
e) Topped up the oil
So what's left? Maybe the valves are sticky? If so, is there any way to fix them? If the remedy is to take the head off, any suggestions about where to find instructions for that?
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