The piston design for the later Triumph 500cc twin-cylinder models was changed to suit the new “hemi” cylinder heads with the omission of the “squishband” and the introduction of larger inlet valves. This piston set, complete with gudgeon pins and circlips is paired with a set of Hastings piston rings. Offered in standard bore as well as in .020″ and .040″ oversizes.
These premium JCC pistons are the 69mm 9:1 compression ratio domed-crown type, as specified for the 1967-later Triumph T100 models. We pair them with a complete set of premium Hastings piston rings.
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, push rod tube seals 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 that may be best left to a professional mechanic to carry out.
Need a set for pre 1967 500 Twins? We have them, PN# CP179
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