RAZOR MX500 MX650 SX500 RSF650 +5 speed booster kit dirt bike scooter rocket

Razor dirt bike scooter quad MX500 MX650 SX500 RSF650 Mykwilwin +5 kit plug-in speed booster adapter. This wire adapter allows you to add a 6 or 7 cell "nimh" 3500mah to 5500mah r/c battery with Tamiya connector into the circuit for added acceleration and top speed. 4 to 7 mph boost. Use with caution and with all safety riding gear. -Also in my Etsy and Yorbin shops (Free USPS 1st class shipping) 3-5 days -How to install video on Youtube/mykwilwin -Current +5 color Black -r/c battery and charger not included #razor #mx500