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Here are the famous valves BOYENSEN competition. These valves are made for the engine that equips the 350cc ET 400cc 4-stroke YAMAHA RD machines.
It will allow an increase of the power but also of the couple! This is a patented double-slat system, a thinner for low revs and a thicker one that goes into action (resonance) for high revs! The fiberglass that designs them is of very high quality! Ideal for equipping your machines unbridled and equipped.
Mounts on :
Yamaha RD 350
Yamaha RD 400
Yamaha RD 400 C / D
Yamaha RD 400 E / F / G
Yamaha RD 400 S
Reference: P400010303001
Full RACING valve kit from home ATHENA
Reference: BOY757
Carbon fiber slats, ideal for equipping YAMAHA RD motorcycles from 1973.
Reference: 40310000
Original type valves for YAMAHA RD 350.