Replacement 100 Watt (Chain Driven) motor, compatible with: E-Spark V41+ E100 (version 10+)E125 (version 10+)E150E175 (version 19+) Razor Part #W13111612030 Note: Model versions can be determined based on the product ID code on your Razor product. The product ID code can be found on the battery cover and/or on the bottom of the frame. The 7th and 8th numbers in your product ID code are the version number of your Razor product (e.g. "01" = Version 1, "02" = Version 2, etc.).