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Retrospective: Triumph 5TA Speed Twin 500cc: 1959-1966

1959 Triumph 5TA Speed Twin 500cc.

Clement Salvadori
January 25, 2008

(This Retrospective article was published in the January 2008 issue of Rider.) STORY BY CLEMENT SALVADORI • photography BY RICHARD TATLOCK This Speed Twin may have been the last of the “gentleman’s rides,” a motorcycle designed for a customer who really no longer existed. It was intended for... Read more »

V-twin Tech: Cooler and better running with Cobra’s Fi2000R EFI Tuner

Rider Magazine
September 25, 2007

Harleys have run too lean for about a quarter-century with emission standards to blame. Never mind that the General Accounting Office (GAO) has told congress that motorcycles are an insignificant source of pollution; they are still regulated and stifled just the same. By forcing very lean air/fuel (AF)... Read more »

V-twin Tech Elements of Power 2: Testing a SuperTrapp Kerker 2:1 exhaust system

Rider Magazine
May 8, 2007

This is the second of a continuing series of articles about how to increase the useful performance of the new Harley-Davidson Twin Cam 96 engine. We are not going to pursue peak power at high rpm; rather, our intention is to find simple and practical ways to improve this engine’s performance in the... Read more »

V-twin Tech Elements of Power Part One: Modifications for the 2007 96-inch Big Twin Engine

Rider Magazine
April 9, 2007

Welcome to the first in a series of articles aimed at giving you a useful selection of modifications for the new 96-inch Big Twin engine. This is also intended to varify the points made in the previous issue’s story, Torque—and how to get some. These modifications should give you useful information... Read more »

V-twin Tech: All About Torque – and how to get some

Rider Magazine
February 8, 2007

Readers often ask me for guidance on getting more performance from their Harleys. Most are looking to improve top-gear acceleration from moderate speeds, like passing a truck or moving into a faster lane. Touring riders need the same sort of power to comfortably climb mountains. Most Harley owners refer... Read more »

V-twin Tech: The 20-Year Harley

Rider Magazine
February 8, 2007

The Motor Company tends to build its motorcycles to remain in service much longer than other brands. I first learned this a couple of decades ago when I asked Harley’s then-V.P. of engineering, Mark Tuttle, why Harleys were so heavy. He said H-D knew that its motorcycles are used for 20 years or... Read more »

V-twin Tech: 2006 Harley-Davidson Reduced Effort Clutch System

Rider Magazine
July 31, 2006

For 2006 Harley-Davidson introduced its new “reduced effort” clutch system on all models. The factory claims that it takes 45 percent less effort to yardin the clutch lever on its 2006 Twin Cam models. Engineers accomplished this by changing three areas of the clutch system: the clutch spring, clutch... Read more »

Testing Air-filter Assemblies fitted to Fuel-Injected Twin Cam Engines

Rider Contributor
July 28, 2006

In our August 2001 issue, we flow-tested air-cleaner kits on the K&N Powersports flow bench. Those filters were designed to fit carbureted Evolution engines. Now the Twin Cam is king, and more than half of the bikes currently rolling off the H-D assembly line are fuel-injected models. So, for this... Read more »

Retrospective: Honda CBR1000F Hurricane: 1987-1988

1987 Honda CBR1000F Hurricane.

Clement Salvadori
April 20, 2006

(This Retrospective article appeared in the April 2006 issue of Rider Magazine.) When this big Honda appeared in 1987, it swept through the motorcycle world like a Category 3 hurricane sweeps across Florida…sorry, could not resist. With more horsepower, more speed than any previous liter bike, it ratcheted... Read more »

V-twin Tech: 95 Conversion

Rider Magazine
January 25, 2006

Current stock Harley-Davidson Twin Cams have enough power for most uses, but not “more than enough.” More than enough is what most riders want, and that’s what we’re offering here. We’ll show you how to get a very real and very useful 33 percent or more gain in performance... Read more »

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