in the tanks. 
Spark plug fouling can provide certain high 
as well as low limits of operating temperatures. 
When excessively low operating temperatures 
are encountered, rapid carbon fouling of the 
plugs will take place. On the other hand, 
excessively high operating temperatures will 
produce plug fouling from lead bromide de- 
posits from the fuel additives. 
Generally, the limited periods of time at 
various high power settings are set to mini- 
mize the accumulation of high rates of wear