Step-by-Step Flex Hone Cylinder Ball Hone Process for Small Displacement Ball Hone Cylinder
A Practical Guide for Motorcycle, ATV, and Small Engine Cylinder Finishing
For small displacement engines—motorcycles, ATVs, dirt bikes, lawn mowers, and other power equipment—the flex hone cylinder ball hone is the go-to tool for cylinder wall deglazing and surface finishing. Unlike rigid stone hones that require specialized equipment and skill, the ball hone for cylinder is designed to be used with a standard handheld drill, making it accessible for home mechanics and small shops alike.
This step-by-step guide covers the complete process for small bore ball hone cylinder walls finishing using a flex hone cylinder ball hone, from preparation to final cleaning.
1. Understanding the Tool
A flex hone cylinder ball hone (also called a ball hone, dingleberry hone, or glaze breaker hone) consists of abrasive globules permanently laminated to flexible nylon filaments attached to a central shaft. The tool is:
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Self-centering: Automatically aligns to the bore
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Used in an oversized condition: The tool diameter is slightly larger than the bore
Important: A flex hone is a surface finishing tool, not a geometry correction tool. It cannot fix out-of-round, taper, or other bore geometry issues. If your cylinder has these problems, you need rigid honing stones or a rebore first.
2. Tool Selection for Small Displacement Cylinders
Choosing the Right Diameter
For small bore ball hone cylinder walls finishing, select a tool that is slightly oversized for your bore:
Choosing the Right Grit and Abrasive
For most motorcycle engine cylinder honing applications, a 240-grit silicon carbide flex hone is a good starting point.
3. Preparation
Safety First
| Item | Requirement |
|---|---|
| Safety glasses | Must be worn during operation |
| Work area | Clean, well-lit, and ventilated |
| Workpiece | Securely clamped in a vise |
Pre-Honing Checklist
4. Lubrication
The #1 Rule: Never Hone Dry
The flex hone cylinder ball hone requires the use of a lubricant at all times. Operating the tool dry will cause the abrasive to load up with metal debris, damage the tool, and ruin the cylinder finish.
Recommended Lubricants
Never use solvents when operating the flex hone.
Lubrication Procedure
| Step | Action |
|---|---|
| 1 | Generously coat the cylinder walls with oil |
| 2 | Coat the flex hone tool with oil |
| 3 | Keep the tool well-lubricated throughout the entire process |
| 4 | Reapply oil between cycles if needed |
5. Step-by-Step Honing Procedure
Step 1: Mount the Tool
| Action | Detail |
|---|---|
| Chuck the flex hone into a heavy-duty drill | Use a corded drill for consistent speed and torque |
| Use the shortest shank possible | Improves stability and control |
Recommended drill: ½-inch heavy-duty drill capable of consistent low-speed operation.
Step 2: Start the Tool Spinning Outside the Bore
| Action | Detail |
|---|---|
| Hold the drill above or outside the cylinder | Start the tool spinning before entering the bore |
| Start at low speed | Gradually increase RPM |
Critical: The flex hone must be rotating upon entry and removal from the cylinder bore.
Step 3: Insert the Tool into the Cylinder
| Action | Detail |
|---|---|
| Plunge straight down | Do not angle the tool |
| Enter the bore with the tool spinning | Maintain rotation throughout entry |
| Continue to the bottom of the bore | Allow the tool to exit the bottom slightly |
Step 4: Honing Stroke
Technique:
| Step | Action |
|---|---|
| 1 | Move the tool in and out of the bore with a steady, rhythmic motion |
| 2 | Allow the tool to come halfway out each side of the cylinder |
| 3 | Accelerate final stroking to develop a 45° cross-hatch angle |
| 4 | Maintain consistent stroke speed—do not pause or hesitate |
Cross-hatch angle note: Smaller-diameter Flex-Hone tools require faster stroke rates than larger-diameter tools to achieve the same cross-hatch angle.
Step 5: Remove the Tool
| Action | Detail |
|---|---|
| Withdraw the tool from the bore while it is still spinning | |
| Pull it out of the cylinder while continuing rotation | |
| Stop the drill only after the tool is fully removed |
6. Cleaning and Post-Processing
Why Cleaning Is Critical
Honing leaves behind metal chips and abrasive debris that must be completely removed before engine assembly. Failure to clean properly will destroy the new piston rings and bearings within minutes of startup.
Step-by-Step Cleaning Procedure
7. Inspection and Quality Check
8. Common Mistakes to Avoid
9. When to Seek Professional Help
A flex hone cylinder ball hone is a finishing tool, not a correction tool. If your cylinder has:
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Out-of-round beyond specification
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Taper beyond specification
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Deep scratches or scoring
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Excessive wear
You will need rigid honing stones or a rebore before using the ball hone.
Need a honing brush for your small displacement engine cylinder finishing?
Send us your bore diameter, engine type, and finish requirements.
Our engineering team will recommend the right honing brush for your application.
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