Triumph 750 TR7 T140 76mm Piston Set Complete w/Grant Piston Rings PN# 71-3676 71-3690 71-3695 US

Here is a complete piston and piston ring set for the Triumph 750 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 8.5:1 compression ratio pistons are suitable for the 750 twins through 1977. Not compatible with the early 724cc engines fitted with 75mm pistons.

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.

Key Features:

• Precision-Engineered Pistons: These pistons are a direct replacement for your Triumph 750cc engine.
  
• Grant USA Piston Rings: Grant rings provide excellent oil control and compression.
  
• Versatile Application: Suitable for various Triumph 750 models, including TR7, T140 Bonneville, and Tiger variants from 1972 onwards.
  
• High-Quality Materials: Constructed from premium cast aluminum alloy for excellent heat dissipation and longevity.
  

Technical Specifications:

• Available in standard bore, +.020 , +.040 , +.060 oversize (confirm your specific engine requirements)
  
• 8.5:1 compression ratio for most applications
  
• Complete set includes pistons, wrist pins, and circlips

Whether you’re rebuilding your engine or simply looking to restore your classic Triumph 750 to its former glory, this piston and ring set offers the perfect combination of quality, performance, and authenticity. 

Please use drop down menu to select size.

Note*** All machine work should always be performed by a qualified machine shop!!

Additional Items:

• Need just pistons? Click here.
• Need just piston rings? Click here.
• We also stock piston sets for Triumph 650 twins click here.
• As well as piston sets for early Triumph 500 twins click here.
• And piston sets for late Triumph 500 twins click here.