Part
Cylinder Hone for Honda CT90, Trail 90 / CB100, CL100, SL100 / CB125, CL125, SL125 / CB175, CL175, SL175 / CB200, CL200 / CB350, CL350, SL350 / CB360, CL360, CJ360 / CB450, CL450, CB500T / CB500K, CB550K, CB550F / CB750K, CB750F, CB750A
This Part Fits the Following Honda Models
- CT90, Trail 90
- CB100, CL100, SL100
- CB125, CL125, SL125
- CB175, CL175, SL175
- CB200, CL200
- CB350, CL350, SL350
- CB360, CL360, CJ360
- CB450, CL450, CB500T
- CB500K, CB550K, CB550F
- CB750K, CB750F, CB750A
Why You Need This
The cylinder hone is an essential tool for a proper engine overhaul or top-end rebuild on Honda models including the CT90, CB100, CB125, CB175, CB200, CB350, CB360, CB450, and CB550. This tool—often overlooked by amateur engine builders—is a ball-style hone designed to refinish the surface of your cylinder walls. It breaks any built-up glaze and provides a fresh surface for new piston rings to seat properly. If your measurements show that your cylinders are within the factory service limits published in your Honda factory service manual, then honing and installing a fresh set of piston rings will restore performance. Note that cylinder hones are sold individually, so be sure to pick the proper size for the engine you’re working on.
We recommend measuring every component of your engine first—using a micrometer, telescoping snap gauges, and dial bore gauge—to assess the condition of your cylinders. This allows you to determine whether a full bore is necessary or if simply honing the cylinder and installing new piston rings will suffice. Contrary to popular belief, not all cylinders require boring; often, there’s more life left in a cylinder than originally thought.
Installation Tip
Lubricate both the cylinder and the hone with motor oil prior to use. This process can be messy, so be sure to wear safety glasses and appropriate clothing. The honing process should be performed quickly—approximately 30 seconds per cylinder at a drill speed of about 800 RPM. Each pass in a single direction should last about 1/2 second, with roughly one-third of the hone protruding from each end of the cylinder. For the final 5 seconds, increase the stroke speed. Always insert and remove the hone while it’s spinning; never allow it to stop inside the cylinder. After honing, wash the cylinder with hot, soapy water and dry it thoroughly to prevent flash rust. The cylinder should be so clean that a white rag or paper towel won’t pick up any residue—wash until it passes the clean towel test.
Video Demonstration
