Restore proper compression and power on your classic BSA A65 650 twin with this matched piston and ring set, supplied with quality Hastings piston rings for reliable sealing and long service life. These pistons are manufactured to original‑type specifications, making them ideal for stock rebuilds on road-going Lightning, Thunderbolt, and other A65 650 models from 1962–1972 (verify your parts book and bore size before ordering).
Each set includes two pistons, wrist pins, circlips, and a complete Hastings ring set for both cylinders, so you have everything needed for a standard top‑end refresh. Use this kit any time you are reboring or rebuilding an A65 650 engine and want dependable parts that install like OEM and keep your BSA running strong for years to come.
Product Features:
- Complete Set: Includes two high-quality pistons and a Hasting piston ring set—everything you need for a full top-end rebuild.
- Precision Fit: Manufactured to original BSA specifications for 650cc unit twin engines, with a 75mm bore to ensure optimal compression and performance.
- Multiple Sizes Available: Choose from +0.020, +0.040, or +0.060 over sizes to match your cylinder’s current condition and ensure a perfect fit.
- Premium Materials: Pistons are crafted for durability and heat resistance, while Hasting piston rings are renowned for their sealing properties and longevity.
- Direct Replacement: Engineered for seamless installation in BSA A65 Lightning, Thunderbolt, and similar 650cc models, matching OEM part numbers 68-0784, 68-0299 H, and 68-0256 H.
Compatibility:
- BSA A65 650 Lightning (all years 1962–1972)
- BSA A65T Thunderbolt
- Other BSA 650cc unit twin models from the same era
Available Sizes:
- +0.020
- +0.040
- +0.060
Part Numbers:
- 68-0784 – EMGO Pistons
- 68-0299 H 68-0256 H – Hastings Piston Rings
The product images shown are for illustrative purposes only and may not be an exact representation of the product received. Manufacturers occasionally make minor cosmetic changes to items, such as color, finish, label, or design. These changes do not impact the item’s function or compatibility. Please contact us if you have specific concerns regarding appearance.
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