This new production cylinder barrel is suitable fitment for the 1950-1962 pre-unit Triumph 650 models with 71mm pistons. Not suitable for use with the later 9-hole cylinder heads. The cast iron cylinder barrel is finished on standard bore and manufactured in the UK. Supplied with a gloss black finish. May require finish honing prior to fitment of the pistons. When the cylinder overbore reaches .060″ and symptoms such as a loss of compression, heavy oil consumption, and smoking exhaust are present, a cylinder barrel is often deemed to be at the end of its service life. A new cylinder barrel is fitted to restore original performance, along with new standard-bore pistons and rings. The top end of the engine from the cylinder base up must be removed for cylinder barrel replacement. This procedure is outlined in the factory workshop manual but may best left to a specialist to carry out the top-end overhaul. 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.
