Yamaha GTS 1000
Template: Infobox motorcycle / Maintenance / parameters
The Yamaha GTS 1000 is so far the only mass-produced motorcycle with axle steering. The Japanese manufacturer Yamaha presented at the 1992 IFMA in Cologne 's new flagship, 1989 Yamaha introduced in the study " Morpho " Considerations on to. Preliminary development made James Parker, on 2 July 1985 received a patent on a steering mechanism, Yamaha acquired the patent rights. [Note 1] The Sports Tourer was produced from 1993 to 1997.
Technology
The Ackermann steering is a type of front suspension of motorcycles rarely applied. Experimental and serial production with wheel hub steering ( steering pin in the hub center) there were in the motorcycle sector, some pure Achsschenkellenkungen were not yet beyond the experimental stage. [Note 2] The first axle steering in series was installed in 1000 (1993-1997) for the model Yamaha GTS. In the Yamaha a lower trailing arms transfers directly at the level of the axle forces, a second upper trailing arm with ball joint transmits the steering motion. The spring leg engages the lower suspension arm and relies on the frame - Yamaha called him Omega - frame - from.
Test Review
A test comparison showed that the unsprung weight on the front wheel with 31.6 kg was much higher than a conventional telescopic fork at 21.5 kg. This required construction requires a high compression damping. Benefits could achieve the Ackermann steering the Yamaha in this test only at higher anti-dive. The overrun was measured at 100 mm and the steering head angle of 66 degrees, the spring travel front was 116 mm and 130 mm rear.
The chassis reaped massive criticism; the theoretical advantage of the double-pivot steering was not visible in the driving test. The in size 130/60 ZR 17 front tire too wide guessed was heavily criticized. Nevertheless, " not the shoe " is retired at Yamaha and delivered the bike in this tire size, despite the improvement proposal on 120/70 ZR reduce 17 until the end of production in order from. For Ulf Böhringer the suspension turned out to be a disappointment:
"The bike seems very unwilling curve in brisk driving on uneven ground. Every joint, every road marking runs behind the front wheel, the handlebars makes you violent work to keep the big bike on track. It falls in principle already not easy to force the GTS in an inclined position or even be angled at an immigrating to curve even further. "
In contrast to the "revolutionary concept " of the front suspension, [note 3] remained Yamaha with the swingarm at the rear wheel on the state of the art. As a driving source of the Sports Tourer, the throttled five-valve engine of the FZ 1000 acted with three-way catalyst, the high fuel consumption has been criticized:
" In Autobahnjagerei gasoline consumption can sometimes over ten liters per 100 kilometers fast when the gasoline control lights, but good 60 km distance are possible at moderate throttle hand. One is the GTS definitely not a machine for do-it -yourself screws. But the dismantling of the six-part panel brings nervous fingers to despair. "
In the secondary drive a less friendly tour chain drive was installed. The bike was available as an option at an additional cost with anti -lock braking system; the model designation was then Yamaha GTS 1000 ( A). In Germany, 1,369 copies have found a buyer. Remainders were sold after the end of series production until 1999.