Yamaha RD250(C) Owner's Manual page 58

C A U T I O N :
See "Break-in Section" prior to operating
engine for the first time.
Warming up
To get m a x i m u m engine life, a l w a y s " w a r m -
u p " the engine before starting off. Never
accelerate hard with a cold engine ! To see
w h e t h e r or not the engine is w a r m , see if it
responds to throttle normally w i t h the Starter
jet (choke) turned off.
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