Upgrade your classic BSA twin with this premium piston and ring set, designed specifically for the legendary BSA A65 650 series—including Lightning, Thunderbolt, and related models produced between 1962 and 1972. This set is ideal for restorations, rebuilds, or performance refreshes, ensuring reliable performance and longevity for your vintage British motorcycle.
Product Features:
- Complete Set: Includes two high-quality pistons and a Grant 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 Standard (STD), +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 Grant 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 US, and 68-0256 US.
- Made in the USA: Grant piston rings are USA-made, trusted by classic bike enthusiasts for consistent quality and reliability.
Compatibility:
- BSA A65 650 Lightning (all years 1962–1972)
- BSA A65T Thunderbolt
- Other BSA 650cc unit twin models from the same era
Why Choose This Set?
Restore the legendary acceleration and smoothness of your BSA twin. These components are engineered to meet or exceed original factory standards, ensuring your rebuild stands the test of time. Whether you’re aiming for a faithful restoration or a reliable daily runner, this kit delivers the performance and fitment your classic deserves.
Available Sizes:
- STD (Standard)
- +0.020
- +0.040
- +0.060
Part Numbers:
- 68-0784 – EMGO Pistons
- 68-0299 US 68-0256 US – Grant Piston Rings
Bring your BSA back to life with confidence—choose this complete piston and Grant ring set for a hassle-free, high-quality rebuild.
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