1988 Kawasaki Mojave 250 Steering Stem Bearing Replacement Guide
Shop parts for a 1988 Kawasaki Mojave 250 ATV.
The steering stem bushing on the 1988 Kawasaki Mojave 250 is the pivot point that every handlebar input passes through on the way to the front wheels. When it wears—from impact loading, moisture intrusion, or accumulated hours—the result is a detectable looseness or notchiness at the handlebars that doesn’t go away on its own. This guide covers the full inspection and replacement procedure for the 1988 Kawasaki Mojave 250.
Reading the Signs of Steering Stem Bearing Wear
Steering stem bushing wear on the Mojave 250 follows a predictable pattern: early wear shows up as a subtle roughness or resistance during slow bar sweeps, which progresses to a distinct notch or indexed resistance near center as the wear groove deepens. The index feeling—where the bars seem to want to sit at straight-ahead rather than hold wherever they’re positioned—is a clear indicator that the pivot surfaces have worn unevenly and the bushing is due for replacement.
Two physical tests supplement the feel check on the Mojave 250. With the front tires off the ground, grip the bars near the stem and try to rock them laterally—pushing one end while pulling the other, not turning the bars. Any play at the pivot point confirms the bushing is worn beyond limits.
Why the Steering Stem Bearing on the Mojave 250 Wears Out
The steering stem on the Mojave 250 pivots through a bushing in the frame every time the handlebars are turned, and the load on that pivot point is not trivial. ATV use generates impact loads through the front suspension that travel directly into the steering stem, plus the lateral forces from changing direction under speed.
Environmental exposure is the second major wear driver for the Mojave 250’s steering stem bushing. Mud, silt, and water can work their way into the steering housing over time, particularly as seals age and become less effective. Abrasive particles suspended in degraded lubricant act as a grinding medium during every steering input, wearing the bushing surfaces far faster than clean-running components would experience.
Tool and Parts List for the Mojave 250
The tools for the Mojave 250’s steering stem bushing job fall into two categories: standard hand tools and a couple of specialized items. Standard tools include a socket set covering the stem nut size and tie rod castle nut size, combination wrenches, needle-nose pliers for cotter pins, and a rubber mallet.
For the Mojave 250, the steering stem pivot uses a bushing rather than a traditional bearing. You’ll need a bushing kit sized for this model—the replacement bushing and any associated seals or thrust washers. A bushing driver or a socket sized to match the bushing outer diameter is needed to drive the new bushing squarely into the housing bore without distorting it. Grease, contact cleaner, and a torque wrench for reassembly complete the supply list.
Exposing the Steering Stem: Disassembly Sequence
Before starting disassembly on the Mojave 250, note any adjustment marks or reference positions at the handlebar mount and stem retaining hardware so the bars go back in the same orientation. Remove the handlebar clamping bolts and move the bar assembly clear of the stem, leaving cables attached where possible. Remove the stem retaining nut and all hardware above the frame housing.
At the base of the Mojave 250’s steering stem, the tie rods connect to a steering arm. Remove the cotter pins from both tie rod castle nuts and unscrew the nuts fully. Release each tie rod end from the steering arm taper with a puller tool—forcing the taper with leverage instead of a puller can damage the steering arm. With both tie rods disconnected, the steering post is free to come out upward through the housing.
Pivot Inspection and Housing Preparation
Wipe the old lubricant off the removed bushing and the post shaft on the Mojave 250 and examine both carefully. Examine the inner bore of the bushing for ovality—a bushing that has worn egg-shaped rather than remaining round allows the post to wobble and produces the looseness felt at the handlebars.
Drive the old bushing out of the housing bore using a driver or socket sized to match the bushing’s outer diameter. Work from one end and drive it out evenly. Once removed, clean the housing bore thoroughly with contact cleaner and inspect it for scoring, raised metal, or distortion from a bushing that was running loose.
Fitting the New Pivot and Rebuilding the Assembly
Installing the new bushing is the step where having the correct driver makes the most difference on the Mojave 250. Drive the new bushing into the Mojave 250’s housing bore using a bushing driver or socket sized to match the bushing outer diameter. The driver must contact the full face of the bushing evenly so it enters the bore squarely rather than tilting. Start the bushing by hand to confirm alignment, then drive it progressively to full depth.
Once the new bushing is seated in the Mojave 250’s housing, apply grease to the post shaft and guide the steering post back down through the housing. The post should slide through the new bushing with light resistance—smooth but not sloppy. If the fit is too tight and the post binds, confirm the bushing seated squarely and fully; a cocked bushing reduces the effective bore diameter.
Final Assembly and Steering Adjustment
With the steering post fully reinstalled in the Mojave 250, snug the stem retaining nut and adjust it to achieve the correct preload: no detectable play at the stem, no resistance or notching through the bar sweep. Secure the nut with the appropriate retention hardware and reinstall the handlebar assembly, torquing the clamp hardware to specification. Confirm that cables run clear of any pinch points through the full lock-to-lock range before considering the bar installation complete.
At the bottom of the Mojave 250’s steering post, reconnect both tie rod ends to the steering arm. Torque the castle nuts to specification and install new cotter pins—never reuse old cotter pins on safety-critical steering fasteners. Lower the ATV to the ground, take a final slow sweep of the handlebars lock to lock, and check that the front wheels track straight when the bars are centered.
Related Shopping Categories
Shop Steering Head Bearing Kits for a 1988 Kawasaki Mojave 250 ATV.
Shop Tie Rod Ends for a 1988 Kawasaki Mojave 250 ATV.
Shop Steering Stems for a 1988 Kawasaki Mojave 250 ATV.
Shop Grease for a 1988 Kawasaki Mojave 250 ATV.
Shop Wheel Bearings for a 1988 Kawasaki Mojave 250 ATV.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your ATV's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.
