Posted by Max on July 07, 2001 at 01:05:51:
In Reply to: Sputtering at constant speed. posted by Dave Alcott on July 06, 2001 at 15:29:12:
Have you made any changes in anything before this started? If so look to what may have happened there.
Where do you live and what is therperature and relative humidity there. I think there is a good possibility that Savages are prone to carburetor icing. Some of the unexplained problems over the years have symptoms like those of carb icing. Polar Pilot can probably give more exact temperatures and humidty levels but generally, carb icing occurs between about 30Deg F and up to 70 F or so when the humidity is such that it can be caused to drop out of the air on cold surfaces. A the air goes through the carb restriction, the pressure and temperature drop to the point the metal is freezing and the moisture in the air sticks to it as ice. Will form both inside the air track and on the outside of the carb until the air velocity changes or the humidity or air temperature changes. Usually the engine finally dies due to an excessively rich mixture and by the time you get to liiking at the carb, the ice has melted and it starts right up. Small airplanes use manifild heat to prevent this or deal with it along with altitude and speed changes. On automobiles we use either manifold heat, exhaust or hot coolant, and on some engines heated inlet air- that funny tube that goes from the heat stove on the exhaust manifold to the snorkel on the air cleaner housing. Motorcyles do not have this provision so as operators we have to learn to change the causes, as we cannot change altitude, humidity or air temperature by much. change engine speed or stop and let is melt and then try driving at a different eninne speed range.Hope this helps some. Max.