BSA A50/A65/A70 4340 H Beam Connecting Rods 6.0" (Pair)

MAP Cycle is proud to offer our 4340 H beam connecting rods. The exotic 4340 forged steel makes for a lifetime rod.

Fits:

• BSA A50 (1962-70) all models including Royal Star, Cyclone, Clubman,
• BSA A65 (1962-72) all models including Lightning, Rocket, Thunderbolt, Firebird, Spitfire and Hornet
• BSA A70 (1971-72) Lightning,

Features:

• Sold in matched pairs - balanced to +/- 1 gram
• Unmatched quality - the best rods available anywhere for Triumph
• "Solid Works" designed and stress tested
• Machined from 4340 forging
• Shot peened for stress relief
• ARP2000 bolts (220,000 lb. tensile strength)
• Innovative machined piston oil squirting notches
• Double wrist pin oilers
• Unique reinforced small end critical areas without adding excess weight or cost

Finite element analyses design by High Cotton MotoWorks allows for:

• Re-shaped pin boss for added strength (helps prevent "pin flex"& small-end failure)
• Double “forced” pin oilers to reduce friction and piston pin heat
• Bushed small end (replaceable) eliminating the need for fragile and expensive DLC pins
• Optimized big-end and pin boss for strength with important weight reduction compared to other steel rods

Note:

• Use with Stock BSA Rod Bearings B2046M
• Unlike the stock BSA rods, these rods have been designed without a big end oiling hole because it is not necessary. Other oiling systems take place of the hole in the big end.
• The factory provides the balance factor for a particular crankshaft. The following information regarding balance factor is provided in the factory service manual of the A65: "The balance factor is 70 percent. This is the proportion of the reciprocating weight (pistons, rings, pin, clip, upper half of the connecting rod, etc.) together with the weight of the big-end assembly, is balanced by the addition of equivalent weights to the crank journals."

Customer Comments:

• "Your con rods arrived yesterday. They are a thing of beauty!!  All perfect! I am extremely impressed with the quality machining and workmanship. Bryce, Queensland, Australia.
• Beautiful! I never thought I could feel this way over connecting rods! guitarguy....eBay purchase
• Brilliant workmanship!  eBay purchase Kal...