CDI Box Unit For Yamaha Grizzly 660 YFM660FG YFM660FA 2002 To 2008 With Spark Boost For Easier Starts And Crisp Throttle Response Removes Speed Limiter Replaces Yamaha Part Numbers 5KM855401000 And 5KM855400000

CDI Box for Grizzly 660: Spark Boost and Higher RPM
✔️ 1 piece CDI box fits 2002-2008 YFM660F; replaces 5KM85540-10-00

A CDI box unit for the Yamaha Grizzly 660 is an electronic control module that boosts spark energy, improves starting, and increases RPM range. It's typically used on quad bikes and 4x4 ATVs to optimize cold starts and throttle precision.

✅ Replaces part numbers 5KM-85540-10-00 / 5KM-85540-00-00
✅ Fits 2002-2008 Grizzly 660 YFM660F/FG/FA 4x4
✅ Increases spark energy for easier starting and crisper throttle
✅ Removes speed limiter, boosting max RPM up to around 7800
✅ 1 piece unit, black color, 3 plugs, 18 pins

💡 What is a CDI box and how does it improve starting and throttle response in ATVs? A handy explanation for riders considering CDI upgrades. - It boosts spark energy for easier starts - It removes the rev limiter for higher RPM - It improves throttle response and idle stability