The SR4 and Phantom 400 rc dirt bikes do not come with steering dampers, only a dual spring system like most other bikes. To help reduce front wheel shakes, here are some creative ways to mount a steering damper to these bikes. You have different options for mounting a damper based on its size. Options for you include a custom servo arm with correct length if damper is too long, extending the damper shaft length if damper is too short, or connecting a damper directly to original stock steering.
Example 1 – SR4 Bike, Atomik MM450/VMX450 steering damper, By Jaco Engelbrecht, aka BKing on RCGroups.
Example 2 – SR4 Bike, HPI Mt2 shock as steering damper, By Iain Temple, aka Templ8 on RCGroups
Example 3 – Phantom 400, Atomik MM450/VMX450 steering damper by Chris Jones, aka ThrottleJunkie on RCGroups.