Royal Enfield Himalayan BS IV 2018 Owner's Manual page 62

STARTING
CAUTION
Never accelerate the engine immediately after a cold start. The engine should be allowed to run slowly for 15 to 30 seconds.
This will allow the engine to warm up and let oil reach all surfaces needing lubrication. Failure to adhere in damage to the
engine.
Manual Bi-Starter

NOTE
It is mandatory, necessary to depress and hold the Manual Bi-starter for a minimum
of one minute when starting the engine for the first time in cold morning, every time
when the temperatures are below 10 deg C, and at higher altitudes to keep the engine
idling RPM steady.
As soon as the engine sufficiently warms up then Manual Bi-starter should be released.
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