Menu
Cycle World
newsletter sign-up
ten best motorcycles
types of motorcycles
new motorcycles
reviews
motorcycle dyno
buyer's guide
comparison tests
gear and products
racing
email
facebook
twitter
instagram
pinterest
youtube
rss
Skip to content
Courtesy of Yamaha
Kenny Roberts Had A Special Weapon That Helped Him Win The 1978 500cc World Championship
Yamaha’s Power Valve delivered broader, more controllable power on the 500cc Grand Prix racer
By
Kevin Cameron
November 30, 2017
Latest
Racing
2021 Grand Prix of Portugal Wrap-Up
Bikes
How Much Power Does the 2021 Aprilia RS 660 Make?
Gear and Products
Triumph SOS App Debuts
Reviews
2022 Triumph Street Scrambler and Scrambler Sandstorm First Look
Reviews
2021 Aprilia RS 660 Road Test Review
Bikes
When Product Development Clashes With Iconic Status
Racing
Royal Enfield Goes Dirt-track Racing
Bikes
2021 MV Agusta Superveloce and Superveloce S First Look
Ask Kevin
A Point About Two-Stroke Scavenging
Bikes
2021 MV Agusta Superveloce and Superveloce S First Look
Gear and Products
Triumph SOS App Debuts
Bikes
When Product Development Clashes With Iconic Status
Ask Kevin
A Point About Two-Stroke Scavenging
News
International Female Ride Day Almost Here
Bikes
The Kawasaki GPz550 Launched the Middleweight Revolution
Bikes
2022 Triumph Scrambler 1200 XC/XE and Steve McQueen Edition First Look
Bikes
Ola Stenegärd, Director of Product Design at Indian Motorcycle
