Stihl FS 111 Bike Handlebar Conversion (Step-by-Step)
A compatible STIHL FS 111 can be changed from a loop handle to a bike handle only with the parts approved for its exact model and revision. Check the machine ID and parts catalog first. Then fit the specified handle and controls, route the cables and wires, and test every control before starting work.
A bike handle can make a brushcutter easier to guide with two hands, but a conversion is not just a handle swap. The throttle, stop switch, cables, harness, and guard must all suit the machine and cutting attachment. A poor fit can bind the throttle or leave you without a working stop switch.
I treat the model plate and the parts catalog as the starting point, not the shape of the old handle. FS 111 variants can differ, and an “FS 111 R” part or kit is not automatically right for every FS 111. If STIHL’s parts information or an authorized dealer cannot confirm the conversion for your exact machine, do not proceed.
Confirm the FS 111 is approved for conversion
This check establishes whether your specific machine can use a manufacturer-approved bike-handle setup. The model name alone is not enough: record the full designation and serial number, then match them to the STIHL parts catalog or ask a dealer to confirm the parts revision.
Find the machine identification details on the unit and keep them with you when checking parts. Ask for the approved bike-handle configuration for that precise FS 111, including any required control handle, clamp, throttle cable, wiring, harness, and guard components. Some parts may be shared; others may differ. Confirm the complete combination rather than ordering by appearance.
Do not assume an FS 111 R kit fits a loop-handle FS 111. If the catalog does not show the conversion, or STIHL support cannot confirm it, stop there. Drilling, welding, using improvised clamps, or adapting an unapproved cable can weaken the setup or affect throttle control.
| Check | What to confirm | Why it matters |
|---|---|---|
| Model and serial number | Exact designation and serial range | Identifies the correct parts revision |
| Handle and clamp | Approved bike-handle parts and orientation | Helps secure the handle as designed |
| Controls and cables | Matching throttle control, cable, and wiring | Prevents binding and control mismatch |
| Harness and guard | Parts for the machine and cutting attachment | Supports control and debris protection |
Before buying, ask the dealer to identify any parts that must be changed as a set. Keep the parts list and receipts. They will help with later service and with checking that the machine has not been returned to an incomplete configuration.
Prepare the machine and work area
Preparation means making the machine safe to handle and checking that its control system and cutting equipment are fit for service. Work with the engine stopped and cool. Disconnect the spark-plug boot before handling the controls, and follow the FS 111 service instructions for any work that requires disassembly.
Set the machine on a stable work surface. Inspect the shaft and handle-clamp area for cracks, bending, or damage. Check the throttle trigger and lockout, stop switch, cable, wiring, harness, guard, and cutting attachment. Do not install new parts over damaged or badly worn parts.
Wear gloves while working around the cutting attachment, and protect it from accidental contact. Keep tools and small fasteners organized so you can spot anything left loose. Use the correct service information for the exact model; do not guess torque values or substitute generic figures.
The FS 111 is a 31.4 cm³ STIHL 4-MIX brushcutter rated at 1.05 kW. It uses a 50:1 gasoline and two-cycle-oil premix with oil approved by STIHL. It is not a four-stroke with a separate oil sump. The listed fuel-tank capacity is 0.71 L; dry weight is about 5.8 kg, depending on configuration, and excludes the cutting attachment and other equipment. Check the manual for your exact variant.
Install the approved bike-handle assembly
The installation is a controlled replacement of the handle and related parts, not a modification of the shaft or controls. Use the exact STIHL service instructions and approved components for your model. If the instructions call for a dealer procedure you cannot safely perform, have an authorized service provider do the work.
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Remove the old assembly. With the engine cool and the spark-plug boot disconnected, remove the loop handle and its clamp as directed in the service instructions. Keep track of fasteners and note the original cable and wire routing before moving them.
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Fit the approved clamp and handle. Position the parts in the specified orientation and location. Do not drill the shaft or force a clamp onto a different diameter. Tighten each fastener to the model-specific STIHL service specification; do not estimate torque by feel.
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Install the matching control handle. Fit the approved throttle control and stop-switch parts. Connect the correct cable and electrical leads as shown in the service instructions. Do not stretch, kink, pinch, or reroute them through an improvised path.
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Route and secure the cable and wires. Follow the specified route and attachment points. Move the handlebar through its full range of movement while checking for tension, snagging, or binding. A cable that catches at one position may stop the throttle from returning to idle.
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Fit the correct harness and guard. Use the harness and cutting-attachment guard specified for the machine and the installed head or blade. Check that the attachment is compatible, mounted in the correct direction, retained securely, and clear of the guard.
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Check controls before starting. Operate the throttle trigger and lockout by hand. The trigger must move freely and return reliably to idle. Check that the stop switch moves freely and that the wiring is secure. If a control sticks or feels wrong, do not start the engine.
Never replace the specified clamp or cable with a homemade part. A handle that seems firm while the engine is off may still shift under use, and a misrouted throttle cable can create an unsafe condition.
Test the conversion before cutting
A functional test confirms that the controls work after installation and that the cutting attachment behaves correctly at idle. Start only as the FS 111 manual directs, in a suitable outdoor area, with the attachment clear of people and objects. Keep bystanders outside the exclusion distance stated in the manual.
First, check that the attachment is mounted correctly and that the guard is secure. Refuel only with the specified premix. Start the engine using the manual’s procedure, then check for stable idle, smooth acceleration, and reliable shutdown at the stop switch.
The cutting attachment must stop at idle. If it spins at idle, the throttle sticks, the stop switch fails, or a cable binds as you move the handlebar, stop the engine and correct the fault before work. Disconnect the spark-plug boot before inspecting or adjusting the control system.
| Test | Pass condition | If it fails |
|---|---|---|
| Throttle movement | Moves freely and springs back to idle | Stop; inspect cable route and control |
| Handlebar movement | No cable or wire tension through its full range | Correct routing before starting |
| Idle | Engine runs steadily and attachment stops | Stop; follow manual or seek service |
| Stop switch | Shuts the engine down | Do not operate until repaired |
| Guard and attachment | Secure, compatible, and correctly fitted | Do not run the machine |
A test that passes once is not a substitute for checking the controls before each work session. If the handlebar, clamp, or control parts shift later, stop and recheck the installation.
Set up and use the brushcutter safely
A correct handle conversion still needs the right harness fit and cutting method. Adjust the harness and machine balance as described in the manual, then check that you can guide the attachment without overreaching. Wear eye or face protection, hearing protection, gloves, sturdy boots, and leg protection suited to the task.
Keep a stable stance and the cutting attachment below waist height. Use only the cutting zone and controlled sweep described for the installed attachment. Check the area for people, traffic, overhead hazards, and hidden objects before starting; keep bystanders at the manual’s stated distance.
Stop the engine before clearing wrapped vegetation, changing an attachment, or making an adjustment. If the attachment strikes an object, inspect it and its retaining parts before restarting. A cracked, bent, or badly worn attachment must not be used.
Two conversion checks in practice
These are illustrative troubleshooting situations, not reports of specific customer repairs. They show why checking the full control path matters more than judging the handle by appearance.
Cable tight at one handle position: After fitting approved parts, the throttle returns at one bar position but feels slow when the handle is turned. Do not “fix” this by adding slack at random or forcing the cable into place. Stop, check the specified route and attachment points, and correct any tension or pinching according to the service instructions. If it still binds, have a dealer inspect it.
Attachment spins at idle: The machine starts, but the cutting head continues to rotate when the throttle is released. Shut the engine down and do not begin cutting. Check for a control fault only with the spark-plug boot disconnected; if the cause is not clear, use the manual’s service procedure or an authorized provider. Do not try to compensate by changing idle settings without the correct procedure.
Maintain and store the converted machine
Maintenance keeps the handle, controls, and cutting equipment ready for the next season. After use, switch off the engine, let the machine cool, and clean plant material from the gearbox, guard, shaft, air intake, and cooling surfaces. Check the handlebar fasteners, harness, attachment, and retaining hardware for looseness, wear, or damage.
Service cutting heads and sharpen blades only as their manufacturer directs. Use the specified blade orientation and sharpening geometry. Do not operate cracked, bent, or badly worn attachments. Follow the FS 111 manual for air-filter, spark-plug, valve-clearance, gearbox-lubrication, and engine service intervals.
If engine idle or tuning is incorrect, use the stated service procedure or contact an authorized provider. Do not tune by ear or defeat emissions controls. Before extended storage, prepare the fuel system as STIHL directs for your fuel and storage period; stale premix can cause poor running and engine damage.
Store the machine dry and secure, with the cutting attachment protected and away from children. Record the approved conversion parts and service work. Before the next season, recheck the handlebar and control fasteners, cable movement, stop switch, guard, and attachment.
Frequently asked questions
These answers cover common decisions after a loop-handle FS 111 owner considers a bike-handle setup. The machine’s exact manual and confirmed parts list take priority where model revisions differ. If a control fails any check, do not use the brushcutter until it is corrected.
Can every FS 111 be converted to a bike handle?
No. Confirm the exact model and serial number against STIHL’s parts catalog or with a dealer before ordering parts.
Will an FS 111 R bike-handle kit fit my FS 111?
Do not assume so. A dealer or parts catalog must confirm compatibility for your machine and revision.
Can I reuse the loop-handle throttle cable?
Only if the approved parts information specifies it. Use the matching cable and controls required for the conversion.
What torque should I use on the handle clamp?
Use the model-specific STIHL service specification. Do not guess or use a generic torque value.
What fuel does the FS 111 use?
It uses a 50:1 gasoline and two-cycle-oil premix with oil approved by STIHL. It does not use a separate engine-oil sump.
Should the cutting attachment turn at idle?
No. If it turns at idle, stop the engine and correct the problem before operating.
Can I run the machine if the stop switch does not work?
No. Repair the switch or wiring and verify shutdown before using the machine.
Can I drill or weld a clamp to make a kit fit?
No. Do not modify the shaft or use improvised clamps, cables, or controls to force an unapproved conversion.
Does the conversion change which guard I need?
It may. Use the guard specified for the machine and the installed cutting attachment, and verify fit and clearance.
What should I check before the first cut?
Check secure mounting, free throttle return, unobstructed stop-switch operation, stable idle, and that the attachment stops at idle.
(This article was written by one of our staff writers, Harrison Croft. Visit our Meet the Team page.)
