⚠️ Safety Warning: When honing a cylinder, always wear eye protection and gloves. Ensure the cylinder is thoroughly cleaned with hot soapy water after honing to remove all abrasive grit and metal particles. If grit remains, it will act as a grinding paste and rapidly destroy your new rings and piston.
If you are installing a new piston or a fresh set of rings, you must "bust the glaze" on the cylinder walls. Over time, the cylinder becomes glass-smooth (glazed), which prevents new rings from seating correctly.
Why Hone the Cylinder?
Crosshatch Pattern: Honing creates a fine 45-degree crosshatch pattern. These microscopic grooves hold engine oil, providing essential lubrication for the rings.
Ring Seating: Without this texture, the new rings will "skate" over the surface rather than wearing in, leading to poor compression and blue smoke (oil burning).
The Honing Process
Tooling: Use a three-leg stone hone or a "flex-hone" (ball hone).
Lubrication: Never hone dry. Use plenty of engine oil or honing oil.
Technique: Insert the hone into the bore and move it steadily up and down while it spins. You are aiming for an even crosshatch pattern.
Cleaning: Critical Step. After honing, scrub the bore with a brush and hot soapy water until a clean white cloth wiped inside comes away spotless.
Important Restrictions
Nicasil Barrels: Do not use a standard stone honing tool on Nicasil-plated cylinders (found on some aftermarket high-performance kits), as it will damage the stones and the plating. Standard R125 iron liners are fine for honing.
Stone Care: Do not use old, worn, or oil-soaked stones that are falling apart.
Shop Tools & Parts
Honing Tools:
Buy Cylinder Honing Tools on eBay UK Piston Kits:
Yamaha YZF-R125 Piston & Ring Sets on eBay UK
if your putting in a new set of rings or a new piston , you must hone the cylinder to break the glaze. This will put a nice crosshatch pattern in the cylinder walls. The crosshatch pattern will hold oil and help lubricate the piston and rings as the rings wear in to the cylinder.
To Hone a Yamaha YBR 125 cylinder is easy . Just stick the hone in the cylinder, add some oil and Move the hone back and forth in the cylinder to produce a cross hatch pattern and in a minute or so your done.
look after your stones , the biggest problems i see with this job is using old tired abused stones.
do not use your honing tool on Nikosil'ed barrels as it will damage your stones and will need replacing .
you can buy honing tool on Ebay UK here
or Amazon UK here .
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