Even with the most careful design, there comes a time when the only way to reach higher rpm and, hence, make more power, is to accept the limits of springs and work around them. This takes into consideration waves reflecting continually in a valve spring and all other parts of [...]Read Full Post | Comments(3)
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The desmodromic idea—using a positive drive to close as well as open valves—is nearly as old as the internal combustion engine itself and has taken many forms. The Mercedes-Benz W196 Grand Prix car won Formula 1 championships in 1954 and ’55 with desmo valve drive. In 1957, Norton applied for [...]Read Full Post | Comments(4)
Why We Ride Movie Tries to Answer The Age-Old Question Here’s our annual list. Tell us what’s on yours.
By all accounts, the new documentary Why We Ride is a beautifully filmed work that will make you want to hop on a motorcycle the moment you step out of the theater. It’s that kind of film. Through exquisite vintage and slow-motion footage from places such as Bonneville, Daytona, motocross [...]Read Full Post | Comments(4)
Camshafts in four-stroke engines turn at one half of crankshaft speed because the valves need to open only once per two crank rotations (720 degrees) that are required to drive the piston through all four strokes of the combustion cycle: intake, compression, power, and exhaust. Each cam lobe is a [...]Read Full Post | Comments(2)
It was a dark, stormy, and surprising morning. My son, John, and I arrived for the opening session of American Supercamp, the traveling dirt-bike school, on this occasion staged at an arena in City of Industry, California, in time for the first chalk talk of the day. Supercamp founder/headmaster Danny [...]Read Full Post | Comments(0)
Failure To Launch China’s motorcycle industry still has a long way to go before it reaches US buyers.
For years, we have been expecting great things from China’s vast motorcycle industry, by far the world’s largest (27 million machines produced in 2012, or one for every 50 Chinese citizens). We’ve gone to the shows and seen the jet-lagged personnel trying to look perky behind lackluster models that reveal [...]Read Full Post | Comments(12)
1. Inspect the battery cables, posts and fasteners. If necessary, clean the terminals with a stiff brush or battery cleaner spray. Make sure the cables and their housings are in good shape and the connectors are secured tightly to the battery. 2. If the battery is not a sealed unit, [...]Read Full Post | Comments(1)
NHRA Pro Stock Motorcycle champion Dave Schultz and his Eagle One Kawasaki Ninja graced the cover of this issue. Schultz won the Pro Stock Motorcycle title in the class’ inaugural 1987 season. He also topped the International Drag Bike Association’s points chase that same year. Schultz, who died from cancer [...]Read Full Post | Comments(2)
Okay, now it’s a trend. First, Suzuki showed the Recursion with its just-over-500cc engine supercharged to give big-bike acceleration. Now, there’s talk of a supercharged Yamaha 250 twin and a blown Kawasaki four-cylinder of unknown displacement. What’s going on here? In the car world, makers are staring at the problem [...]Read Full Post | Comments(13)