Bring your engine back into proper operating condition with this 1st Oversize (0.25mm) Piston Kit, manufactured in Japan for superior quality and precise fitment. This kit includes a 0.25mm oversize piston, along with matching piston rings and piston pin, making it ideal for engines that have been bored to the first oversize specification.
Oversize piston kits are commonly used during engine rebuilds to address cylinder wear after machining. Installing properly sized pistons and rings helps maintain compression, improve sealing, and support smooth engine operation.
Key Features
• 1st oversize (0.25mm) piston kit
• Includes piston, piston rings, and piston pin
• Japanese-made for superior quality and durability
• Ideal for engine rebuilds following cylinder boring
• Precision components designed for dependable engine performance
Important Notes
• Each kit rebuilds one piston. Four kits are required to rebuild all pistons on the engine.
• Piston pin clips are not included and are sold separately.
Fitment / Compatibility
• Honda CB750K (1969–1976)
• Honda CB750F (1975) Supersport
• Honda CB750F (1976) Supersport
Note: For the 1976 CB750F model, this piston only fits engines with serial numbers below #2551568. Please verify your engine serial number before purchasing.
Check the listed model and year, then read any fitment notes in the description.
| Make | Model | Year |
|---|---|---|
| Honda | CB750K Standard | 1969 |
| Honda | CB750K | 1970 |
| Honda | CB750K | 1971 |
| Honda | CB750K | 1972 |
| Honda | CB750K | 1973 |
| Honda | CB750K | 1974 |
| Honda | CB750K | 1975 |
| Honda | CB750K | 1976 |
| Honda | CB750F Supersport | 1975 |
| Honda | CB750F | 1976 |
No listed models match your search.
Free ground shipping over $50
To the USA & Canada. In-stock orders usually ship from our own warehouse the same or next business day.
| Destination | Delivery time |
|---|---|
| USA | 4–7 business days |
| Canada | 2–6 business days |
Ground shipping includes tracking, emailed when your order ships. Need it sooner? Express options are available at checkout.
60-day returns on eligible parts
No restocking fees. Eligible parts must be unused, uninstalled, unaltered and complete. The 60-day window starts when your order is delivered.
Electrical parts are excluded from standard returns. Check return eligibility.
Start your return below. Wait for our instructions before mailing a part back.
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Canada Post Economy: Available at checkout for select small items. Allow 1–3 weeks for delivery. No tracking or insurance is included.
Outside the USA & Canada: Delivery times vary by destination and shipping method. Buyers are responsible for applicable duties, taxes and import fees. We cannot mark orders as gifts.
Frequently Asked Questions
How many 0.25mm oversize piston kits are required for a complete SOHC CB750 rebuild?
One kit rebuilds one cylinder. Four kits are required to replace the pistons in the complete four-cylinder engine.
What is included in each 0.25mm oversize CB750 piston kit?
Each kit includes one 0.25mm oversize piston, matching piston rings and a piston pin. Piston-pin clips are sold separately.
Does the cylinder need machining for the 0.25mm oversize piston?
Yes. Have the cylinder professionally measured, bored and honed to the clearance required by the measured piston; do not install it in a standard-bore cylinder without the required machining.