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Hey 2quiiker the Yamaha intake Boot on 350 big bears that connects Carb to the Head go bad and leak see if the Rubber is cracked or come loose.
This is EXACTLY what I was suspecting with my Big Bear. I would win it for 30 min. Then it would back fire so hard it would stall. I noticed the boot in the center the rubber was fluttering every time it backfired.