A little helper juice
I ran a small plastic tube from the air cleaner to just below the gas tank to flow a shot of WD-40 or carb cleaner into the intake before the carb in cold weather. The engine likes this little shot of helper juice -fires right up. Like OP noted, after the engine is warm the stock battery does the job. No difference was noted when I changed oil viscosity.
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Sun Chaser, or 'Dr.G', Professor of Motorcycle Adventure at SOUND RIDER magazine. Professional Motorcycle Adventurer/Indian Motorcycle Racer/journalist/author/global economist/World's # 1 Motorcycle Adventure Sleeper & Wastrel
Soul Sensual Survivor: www.greataroundtheworldmotorcycleadventurerally.co m
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