24 ROUGH-AND-TUMBLE ENGIN 



ami is made fast to the stem. The second nut is a loose 

 jamb nut. To increase the speed of the engine loosen 

 this janih nut and take hold of the thumb nut and turn 

 it back slowly, watching the motion of your engine all 

 the while. When you have obtained the speed you re- 

 quire, run the thumb nut down as tight as you can with 

 your ringers. Never use a wrench on these nuts. To 

 slow down or slacken the speed, loosen the jamb nut as 

 before, except that you must run it up a few turns, then 

 taking hold of the thumb nut, turn down slowly until 

 you have the speed required, when you again set the 

 thumb nut securely. In regulating the speed be careful 

 not to press down on the stem when turning, as this will 

 make the engine run a little slower than it will after the 

 pressure of your hand is removed. 



If at any time your engine refuses to start with an 

 open throttle, notice your governor stem, and you will 

 find that it has been screwed down as far as it will go. 

 This frequently happens with a new engine, the stem 

 having been screwed down for its protection in trans- 

 portation. 



In traveling through timber with an engine be very 

 careful not to let any over-hanging limbs come in contact 

 with the governor. The governor referred to is the fly 

 ball or "throttling governor." A throttling governor is 



