|
Steve: Your '80' uses the same carb as my '70'D. On later '820' models, there was an oil pressure activated fuel-shut-off diaphram. Your '80' would only have one of these if it had been retrofitted. There's no diaphragm in the carb, so I'm not sure what diaphragm you might referring to. If not, it should be equipped with a manual fuel shut-off valve. In normal operation, you would open this valve just prior to starting the cranking engine. After the cranking engine has been used to start the main engine, you then close the valve and let the cranking engine carburetor bowl run dry. This will keep any bouncing of the float from leaking gasoline into the pony manifold and then into the pony crankcase oil. The float needle might be sticking so that you need to prime it after a idle period. Those floats were originally cork, and can and do often deteriorate. If you haven't had it apart in a while, cleaning that carb might be benficial. The gasket/jet/needle kit and float are available from Deere, and that might be a good place to start. Cleaning the passages on the bowl side will likely help. The load jet sits in the bottom of the bowl and always seems to get trash in it. If you can determine if it has been retro-fitted with the oil pressure fuel shut-off diaphram valve, then that diaphram might be ruptured as well. I think you might want to find the manual shut-off valve off of a 70 or 80 and install that. Using that valve will keep the carburetor nice and dry between starts. Hope this helps ! Frank-in-Tallahassee
70D // 855
| 
