x 1-Rallye _ dei_Faraoni_1991 _

Yamaha XTZ 660 Wild Team 1991

The dream was running a Dakar riding a motorcycle tailored: Maximum Montebelli and Fabio Marcaccini thought for the first time on a bike intended to run in African rallies during a night buianel January 1988 When, in the company of several other private pilots were forced to withdraw from the race course of the long leg (In addition 800 kilometers) that led the pilots of the Paris Dakar from Bordj Omar Driss in Tamanrasset. To return the two began the creation of increasingly popular special designed to run in the classic Africa.

The Wild Bikes prepared for the season 1991-92 He had already won with Marcaccini on 13rd place in the tenth edition of the Rallye des Pharaons and is ready for the first participation of Dakar.

This special is built around the single-cylinder Yamaha that Mans XTZ 660 Ténéré. The engine is the part subjected to minor changes. Only the profile of the cams, controlling the 5 distribution valves was vicious to increase power. On any other component we wanted to intervene, thus preserving the robustness and reliability of the Yamaha single-cylinder. Even the electric starter was kept, which on one hand penalizes a few pounds the bike, on the other hand, proves very useful in lighting after the inevitable falls and related flooding. Water cooling uses a large frontal radiator taken from a Cagiva Mito on which was mounted a electric fan, driven both by a thermostat and manually by the pilot via a button on the handlebars.

Strictly series is also the dual carburetor body YDIS, that has changed only the adjustment, adding a little carburation. The engine is not only a happy exception. The original Yamaha 660 Ténéré, Hence the Wild Bike stems, only the registration numbers on the tube of the frame. Everything else was rebuilt with materials and geometries, starting from the angle of the Steering head who is now 28°. Quite remarkable for a bike that, Although special, remains a-road bikes. But in the desert, in the sand, more than agility we need a great stability in mixed-fast features of African roads.

Dry the bike, excluding 55 LT fuel contained in the tanks, weighs only 165 kg. A very good if we don't think we are faced with a master from some official team, with so many resources and technologies but before the result of the work and passion of a group of motorcycle enthusiasts, dividing head office and workshop with a carpentry workshop in an old farmhouse. Of course, massive was the use of special materials and the end result is not achieved at the expense of general reliability: of the three motion presented by Wild Parisian Paris-Dakar Team at the start of the 1991, not one presented during the race problems and sagging.

All three could get the satisfaction of supporting the wheels on the beach in Dakar with good positions. The chassis has undergone radical cure and remade virtually from scratch. The end result is the result of experience at the forefront of motorcycle riders boarding only and open the gas, but that they spend the night between one stage and the other working on their middle. The project focused on the search for greater resistance in the most stressed areas (as attacks the Steering and shock absorber), and defining a different weight distribution (with a clear imbalance towards the rear, that helps the front wheel to float on the sand thus enhancing easy-riding the bike).

For the construction of the cradle, adopting the classic solution to split motor ship, Columbus tubes have been used known chrome-moly TIG welded with the process (Tungsten Inert Gas). Frame and swingarm have been tempering treatment, to balance the different stiffness between pipes and welding to prevent breakage for different loads tensions.
Proud of your work, the boys of Wild Team do not hide the help and recommendations received by BYRD Although accepted and processed independently, starting with the design of the rear and its kinematics porcellone crux of the bike and its guide. The swingarm, in Anticorodal, It is now well 32 mm longer than the one mounted on the Yamaha 600 TT and with extraordinary stiffness.

Of course completely revised was the Mono-shock suspension group, He now uses components of White Power, that, In addition to materials, provided the team advising. Before you put a fork of 40 mm upside down. A solution is not common among the bikes dakariane, but that, According to the pilots, has led to a considerable increase in torsional rigidity of the fork, absorbing magnificently the warping which are imprinted on the front when approaching at high speed bumps and oued, or when braking.

The plates, avional, am billet with a fully manual processing by company Martini Gambettola (FC). The tank is made of aluminum and divided into two semi autonomous shells lashed to the chassis central beam on silent blocks. The latter one, kevlar, doubles as a crib, claiming saddle and rider. Fuel transfer between the two tanks is connected via a vacuum pump, operated from playing carburetor air flow which is connected with a pipe. The left side of the Central tank has a large hole for draining engine hot air flow and is provided with a hole for radio balises.

Between the two halves, above the upper beam that also functions as a motor oil tank, place the battery, It depends upon the operation of the entire electrical installation. Next to the battery is place the air filter element. Paper type, is from none other than by Fiat Uno diesel, and is protected by a box made of aluminium with holes at the rear air inlet. Under the front frame cradle is placed a small tank contentnente 5 litres of water required for regulation.

Mountain wheels magnesium hubs and alloy rims from channels in the classic measures of 2.50×18"and 1.85×21”, on which are mounted Michelin with mousse both front and back. The brakes are sourced BYRD, with before a disk 300 mm and caliper YZ (mounted on models cross of Yamaha) Double piston and back a disk 230 mm Brembo double piston caliper contrasted. Both disks that are floating pumps. Pinion and Crown are made of special alloy from the firm Chiaravalli, that gives the team the chain mod. GY520X0, from exceptional strength during the last Paris Dakar has not had to be replaced!

The bridge is impressive as that of a steamer. front Ergal handlebar, mounting commands and original packing Yamaha, dominates the road book MD electrically controlled. Above and below your trip master: the main one of ICO and the secondary, for the running totals, Honda backgrounds. Sideways is a gyro compass of aeronautical derivation mounted on anti-vibration pads.

Text and photos Fabio Marcaccini