The hottest segment of the off-road motorcycle market is high-performance four-strokes, and the most popular of those are Yamaha's motocross and off-road line of machines. In this Motorbooks Workshop title, Off-road enthusiasts would be treated to 30 projects for their Yamaha high-performance four-stroke motorcycle. It would include the YZ250F, YZ400/426/450, and the WRF variants. Mods would focus on making the bikes work better day-to-day, with a few engine overbores and so on in the mix.

The Honda high-performance four-stroke motorcycle is one of the most popular off-road motorcycles in the country. In this book, widely known and highly respected tuner and journalist Eric Gorr, Dirt Rider's Dr. Dirt and owner of Forward Motion, takes off-road enthusiasts through the paces of performance projects for their Honda CRFs. Whether it's a CRF450F, CRF250F, CRF450X, or CRF250X, your high-performance four-stroke Honda comes under Gorr's purview as he details the ins and outs of buying, maintaining, and upgrading the CRF-and doing the best off-road bike one better.

If the greatest stars and biggest fans of Supercross put together a scrapbook, it couldn’t be any better than this close-up, action-packed celebration of one of the most popular motorsports in America. The greatest moments in Supercross come to vibrant life in essays, photos, and behind-the-scenes glimpses from the sport’s current pros and past champs --all framed by the matchless lens of acclaimed motorsport photographer Simon Cudby. From profiles of the hottest names in the sport to insightful takes about the changes in the sport from up and coming young guns, it’s all here in the stirring words and images of the biggest names in Supercross.

Crucial maintenance tasks and valuable performance projects, including suspension revalving, valve and cam servicing, jetting, and changing ergonomics, are covered in step-by-step fashion.

DIVThis thorough how-to manual helps the off-road motorcycle enthusiast get the most out of their machine. This one-stop reference covers everything from basic maintenance to performance modifications, including: • Engine rebuilding• Transmission rebuilding• Clutch repair and rebuilding• Big-bore kits• Cam kits and valve timing and tuning• Tuning stock suspension• Suspension revalving and kits• Jetting and tuning carburetors• Tuning electronic fuel injection• Wheels, tires, and brakes• Chains and sprockets• Cooling systems • Electrical systems/div

Maintenance and preparation for competition bikes, and tuning tips.

How to maintain, modify and set-up every component and correct common flaws.

A British scientist formulates a new oil refining technique, based on the use of bugs...It could change everything. Only Russia can check the Red Chinese menace, but is Russia the right place to go with this formula?The scientist must escape from Rangoon to Russia. Soviet agents arrange this, but China, Britain and America are equally determined to get the formula. Who will end up with the formula?British Secret Serviceman James Dingle has to pit his wits against the Russians, the Chinese and Burma's formidable counterespionage chief. Will he succeed, and most of all, will he survive?A dangerous chase ensues that leads Dingle through Burma and reaches its exciting climax high in the Himalayas.The Power Bug is a chilling tale of espionage in a race against time, full of suspense until the very last page. Praise for Geoffrey Osborne 'A chilling political thriller' - Richard ForemanGeoffrey Osborne is an author of suspense thrillers, including Checkmate for China, Death's No Antidoteand Balance of Fear.