I can imagine that while riding the Yoshimura-built GSX-R1000RR and glancing down at the speedo on a highway one day, realizing that the triple digits on Thai roads could propel me me to heaven faster than I would like. The Yoshimura GSX-R1000RR was build and homologate in light of the Superbike regulations, which states that all motorcycles must be based on production street motorcycles.
Suzuki and Yoshimura have been tied at the hip since 1978, and in that time they have amassed numerous roadracing titles, not to mention a whole lot of knowledge about Suzuki motorcycles. The beauty of the WSB rules is that whether you are a sportbike junkie looking for trick parts, a track-day rider seeking more thrills or a privateer racer trying to knock another second off your lap times, you can find most of what you need in Yoshimura's parts catalog. You can mix-and-match parts to accomplish your performance goals. The question boils down to how much money are you willing to spend for that extra speed.
The black Yoshimura GSX-R1000RR is definitely flying stealth. On the street, the Yoshimura GSX-R1000RR looks like any other Suzuki GSX-R1000 equipped with an aftermarket exhaust, raising no red flags. But at the racetrack, it is obvious that the Yoshimuri build GSX-R1000RR is special, making other 1000cc's look like they are not moving. With a claimed top-speed of over 309km/h. Optimistic speedometer? Likely, yes, but wickedly fast, no matter the speedo calibration error. The engine received a healthy dose of Yoshimura parts, which let loose 17 additional horsepower over a stock Suzuki GSX-R1000 and a couple added kicks of torque, too. The Yoshimura Type-R camshafts offer 0.4mm more intake lift and slightly less duration than stock for improved midrange. A thinner head gasket bumps the compression ratio up. A BMC race air filter, 3.95 kilogram Yoshimura R-77 Titanium full-race exhaust with carbon-fiber silencer and end-cap and that is 9.40 kilogram lighter than a stock Suzuki GSX-R1000 exhaust system, and the Yoshimura EM-Pro engine-management computer all optimized for 91-octane pump fuel.
Helping to lay down the added power - especially considering that Yoshimura fitted the GSX-R1000RR with a set of special race-specific slick tires – are several chassis upgrades. At the rear, repositioned inserts move the swingarm pivot up 2mm in the frame to steepen the swingarm angle (relative to the ground), which improves rear-wheel traction and keeps the GSX-R1000RR from squatting under power. It also helps maintain chassis composure because at maximum cornering load, the swingarm approaches but doesn't typically pass horizontal, maximizing the effective wheelbase for added stability. A 159mm suspension linkage has a more linear rate to improve suspension action during high cornering loads. This link mates to a Showa shock that features an external hydraulic preload adjuster and is equipped with a ride-height-adjustment kit. Race-rules stipulate that the fork must retain the stock internal and external tubes, so Yoshimura re-valved the unit in-house. An interesting addition are the Fork Cap Extenders that allow the front end of the GSX-R1000RR to be raised an additional 25mm if desired. Brakes are upgraded with Galfer 1375 pads at the front, as well as stainless-steel braided lines front and rear.
The Yoshimura GSX-1000RR is in Thailand only available for special orders, it's not allowed on the public road as it's not able to pass Thai exhaust emission test.