Yamaha RD350A on Point Ign System. YouTube

Yamaha Rd350a. Yamaha RD350A 1973 The 1974 RD350A was ruby red (purpleish maroon) with a double white. Due to its lighter design, this motorbike, although costing only around $908, beat motorbikes of other popular brands with price tags ranging from $2,000 to $3,000.

Yamaha RD350A 1973
Yamaha RD350A 1973 from suprememotos.com

[2] It evolved directly from the piston port (pre-reed valve intake tract), front drum-braked, five-speed Yamaha 350 cc "R5" Yamaha's specified spark plug for the RD 350B is an NGK B8HS, which is supposed to have a very wide heat range electrode

Yamaha RD350A 1973

Contrary to popular opinion, there's no evidence supporting the idea that the "RD" in the Yamaha RD350 model designation stands for. As a result of Yamaha's "Torque Induction" system — along with a crankshaft supported by large ball bearings, with roller bearings at the bottom and needle bearings at the top of the connecting rods and a 6-speed. If the plugs are new, they function okay for a while

Yamaha RD350A Year I.D. DO THE TON. Evolving from the Yamaha R5—a 350cc, 5-speed bike with a piston port engine and front drum brakes—the RD350 introduced a 6-speed, air-cooled. As a result of Yamaha's "Torque Induction" system — along with a crankshaft supported by large ball bearings, with roller bearings at the bottom and needle bearings at the top of the connecting rods and a 6-speed.

Yamaha RD350A Year I.D. DO THE TON. [2] It evolved directly from the piston port (pre-reed valve intake tract), front drum-braked, five-speed Yamaha 350 cc "R5" The 1974 RD350A was ruby red (purpleish maroon) with a double white.