Well I have run into a bit of a problem with my clark forklift. After a few months of getting headaches I went out a purchased a Carbon Monoxide detector. Now I found the cause of my headaches. I am getting readings of 100 - 150 parts per million. I have recently had the forklift tuned up. New rad, rebuilt starter, plugs points, thermostat...etc. I was experiencing a problem with water build up in the oil pan due to forklift not reaching proper operating temp. Is there some other place I should be looking for the cause of the carbon monoxide? Could it be the carb or propane converter...?