1987 Yamaha YFM200 MOTO-4 Steering Stem Bearing Replacement Guide
Shop parts for a 1987 Yamaha YFM200 MOTO-4 ATV.
The steering stem bushing on the 1987 Yamaha YFM200 MOTO-4 is the pivot point that every handlebar input passes through on the way to the front wheels, and it works harder on a utility ATV than most riders realize. Heavy loads, towing, and the constant grinding of utility work in rough terrain all wear this component down over time. This guide covers the full inspection and replacement procedure from identifying wear through final reassembly.
Warning Signs the Steering Stem Pivot Needs Service
The most reliable early indicator of a worn steering stem bushing on the YFM200 MOTO-4 is a notchy or gritty feeling when turning the handlebars slowly through their full range with the front end lifted.
Play at the steering post is the next test to perform on the YFM200 MOTO-4. With the front end safely elevated, grip the handlebars near the stem and attempt to rock them laterally—pushing one side while pulling the other, not rotating the bars. Any detectable movement at the pivot point indicates the bushing has worn past its service limit and the post has clearance it shouldn’t have.
Setting Up for the Job: Tools and Supplies
The steering stem bushing job on the YFM200 MOTO-4 requires a floor jack or ATV lift to support the machine safely with the front end elevated for part of the procedure. Beyond that, the tool list is straightforward: a socket set covering the stem retaining nut and tie rod castle nut sizes, combination wrenches, a cotter pin puller for the tie rod ends, and a rubber mallet for stubborn-but-not-forced components.
The YFM200 MOTO-4 uses a bushing at the steering post pivot—typically a bronze or composite sleeve that the post slides through. A bushing kit sized for this model includes the replacement bushing and associated seals. A bushing driver or socket sized to the bushing outer diameter seats it squarely without distorting the bore.
Why Utility ATV Steering Stem Bushings Need Regular Attention
The steering stem bushing on the YFM200 MOTO-4 handles a heavier workload than the equivalent component on a sport ATV. Utility machines carry cargo, tow trailers, push through heavy brush, and navigate rutted farm trails where the front end is constantly absorbing impact loads from uneven ground. Every one of those impacts transmits force up through the front suspension and into the steering stem, which transfers it directly into the bushing at the frame pivot point.
Moisture and contamination are equally damaging on the YFM200 MOTO-4. Utility ATVs regularly work in wet fields, cross creeks, push through mud, and get pressure-washed after messy jobs—all of which expose the steering housing to the kind of contamination that works past aging seals and into the pivot surfaces.
Removing the Steering Post from the YFM200 MOTO-4
Start with the YFM200 MOTO-4 supported safely and the front end elevated. On utility machines with full front racks or accessories, it’s worth removing any rack hardware that would obstruct handlebar removal before starting. The handlebars come off the top of the steering post as an assembly; remove the handlebar clamp bolts and set the bar assembly clear, keeping throttle, brake, and choke cables connected where possible to avoid disconnecting more than necessary.
Remove the cotter pins from the tie rod castle nuts at the steering arm, then remove the castle nuts and press each tie rod end free from the steering arm taper using a proper tie rod end puller or a firm side tap on the steering arm boss with a rubber mallet—not the threaded rod end. Once both tie rods are free, remove the stem retaining nut and any lock tabs or washers beneath it.
What to Look For When Inspecting the Old Bushing
On the YFM200 MOTO-4, wipe the old grease from the bushing and post shaft and look at the contact surfaces. A bushing worn oval or egg-shaped rather than remaining round allows the post to rock and produces the play felt at the handlebars. Scoring or grooving on the bushing bore from contaminated lubricant indicates the bushing has been running with grit in the contact zone.
Drive the old bushing from the YFM200 MOTO-4’s housing bore using a driver or socket sized to the bushing outer diameter. Work from one end and keep the driver centered to drive it out evenly. Once removed, clean the bore with contact cleaner and inspect the bore surface for scoring, roughness, or ovality from a bushing that was spinning in the bore rather than staying fixed.
Installing the New Bushing in the YFM200 MOTO-4
Drive the new bushing into the YFM200 MOTO-4’s housing bore using a driver or socket sized to the bushing outer diameter. The driver must contact the full face of the bushing so it enters the bore straight rather than tilting. Start the bushing by hand to confirm alignment before applying driving force. Drive it progressively to full depth, pausing to check alignment after each set of blows.
Guide the steering post of the YFM200 MOTO-4 back into the housing from above, seating it into the freshly installed bushing. The post should enter the bushing with light, smooth resistance—not sloppy, not binding. If the post binds before it seats fully, confirm the bushing went in straight; a cocked bushing reduces the effective bore diameter and causes exactly this symptom.
Buttoning Up: Tie Rods, Handlebars, and Final Check
With the steering post back in the YFM200 MOTO-4’s frame housing, reinstall the stem retaining nut and tighten it to the point where all play is removed from the pivot without introducing binding or resistance through the bar sweep. The correct preload feels like smooth, light steering resistance throughout the full lock-to-lock range with zero detectable looseness when the post is pushed and pulled laterally.
Reconnect the tie rods to the YFM200 MOTO-4’s steering arm: seat each tie rod end stud in its taper in the steering arm boss, thread on the castle nut, and torque it to specification before installing a new cotter pin. Never reuse the old cotter pins on steering fasteners. Lower the machine to the ground and perform a final lock-to-lock check by gripping the bars and sweeping them slowly from one stop to the other.
Related Shopping Categories
Shop Steering Head Bearing Kits for a 1987 Yamaha YFM200 MOTO-4 ATV.
Shop Tie Rod Ends for a 1987 Yamaha YFM200 MOTO-4 ATV.
Shop Steering Stems for a 1987 Yamaha YFM200 MOTO-4 ATV.
Shop Grease for a 1987 Yamaha YFM200 MOTO-4 ATV.
Shop Wheel Bearings for a 1987 Yamaha YFM200 MOTO-4 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.