Here is a complete piston and piston ring set for the early unit-construction Triumph 500 models that delivers top performance at an economical price. The cast JCC/Emgo reproduction pistons have been the industry standard for street use for years. We have combined the piston set with a set of high quality Grant piston rings, featuring a one-piece oil control ring for easy fitment. Available in standard and oversizes up to .060″. The 9:1 compression ratio pistons are suitable for the 500 twins through 1966 with the “squish-band” cylinder heads. Not recommended for the 1967 and later Triumph 500 models.
Marketed by Emgo, the JCC pistons are precision manufactured to exacting standards and include the wrist pins and circlips. The US-made cast-iron Grant piston rings are a complete set of (4) compression rings and (2) oil control rings, enough for both pistons. The compression rings are marked with “top”, indicating the orientation in the piston ring grooves.
The pistons must be fit to the cylinder barrels when overboring. The machinist measures the pistons and performs the cylinder boring and finish honing to a specified clearance. The piston rings are checked and adjusted for the proper end gaps prior to fitment to the pistons. It is advisable to replace all of the top end gaskets and sealing washers when pistons and piston rings are renewed.
Failure to achieve proper fitment of the pistons and piston rings can result in a noisy engine, with high oil consumption. Following the proper installation procedures, as outlined in the factory workshop manual is recommended when fitting new pistons and rings. This job requires specialized tools and skills and may be best left to a professional to carry out the task.
Precision-Engineered Pistons
- Our Triumph Early 500 Pistons are meticulously crafted to meet or exceed OEM specifications:
- Manufactured from high-grade aluminum alloy for optimal strength and heat dissipation
- Precision-machined to exacting tolerances for improved performance and reliability
- Designed to maintain the authentic feel and character of your classic Triumph
Grant Rings: Superior Performance
- Paired with these exceptional pistons are the renowned Grant Rings, known for their quality and durability:
- Excellent sealing properties for enhanced compression and reduced oil consumption
- Quick and consistent break-in period for optimal performance
- Durable construction to withstand the demands of vintage engines
- Clear markings for hassle-free installation
Compatibility and Specifications
This piston and ring set is specifically designed for:
- Triumph 500cc models produced between 1958 and 1966
- Compatible with various Triumph motorcycles, including the T100, Tiger 100, and TR5 Trophy
- Available in multiple oversizes to accommodate your specific engine needs
- Weight-matched pistons for balanced performance
- 9:1 compression ratio for improved power output
- Slipper-style pistons for reduced friction and improved efficiency
Need a set for pre 1967-74 Triumph 500 Twins? We have them, PN# 70-6884
Please use drop down menu to select size.
Additional Items:
- Need just the pistons? Check here.
- Need just the rings? Check here.
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