1987-2009 Yamaha ATV YFM350X Warrior Raptor Service Manual, Page 228Get this manual
ELECTRICAL STARTING SYSTEM
7Starter motor -Connect the battery (12V) to the starter motor cable using the jumper lead (2)
AWARNING
-A wire for the jumper lead must have the
equivalent capacity as that of the battery lead or more, otherwise it may cause the jumper lead to be burned-This check is likely to produce sparks, so be sure that no flammable gas or fluid is in the vicinity
Battery (+Terminal Starter Motor Cable