Does it offer the local racer a platform on which he can compete without spending upwards of twelve grand? Is a stock YFZ capable of handling the demands of a modern motocross track without the benefit of aftermarket components? Before we can answer these questions, lets take a closer look at what makes this machine so special, and its updates for The exhaust system on the YFZ is as restrictive as it is quiet.
Should you decide to keep the stock airbox lid in place, removing it for filter access is as easy as removing three metal clips. Machine overview At the heart of the YFZ is a cc 5-valve liquid cooled 4-stroke engine.
Lubrication is handled via a dry sump setup, with the machines oil stored in an oil tank in front of the engine for better cooling. With its bore and stroke numbers measuring in at 95mm x 62mm its obvious that Yamaha designed this large bore short stroke motor to rev.
To decrease moving mass and further increase the engines ability to rev, Yamaha utilized a piston with a short skirt and small pin boss, lightweight titanium valves, and a lightweight flywheel. Chain adjustment is more simple then on previous Yamaha sport models. Carburetion is handled by a 39mm FCR Keihin with a throttle positioning sensor. The TPS is an electronic sensor that adjusts the ignition curve to match throttle position. The goal?
Quick throttle response. Air filter access is a 30 second process thanks to a lid that is held in place by three metal latches. All of this is mated to a five-speed manual clutch transmission, with final drive to the rear axle being handled by a sealed O-ring chain. It is constructed of tubular high tinsel steel with a geometry designed specifically for competition. Still on a quest for weight savings, Yamaha equipped the YFZ with a plethora of aluminum chassis parts.
These items include the upper a-arms, one piece cast aluminum swing-arm, and a cast aluminum rear subframe. All are very trick by production ATV standards. Chain adjustment is much more simple then on previous Yamaha models, and the subframe is removable for easy maintenance.
The YFZ has a slim midsection, wide pegs, and rider positioning is spot on for maximizing control. Yamaha went to the top shelf of production suspansion for the YFZ. Up front the features preload, compression, and rebound adjustable Kayaba piggyback reservoir shocks, featuring 9.
Rear suspension duties are handled by a remote reservoir equipped preload, compression, and rebound adjustable Showa. Rear suspension travel measures in at To bring the machine to a halt, the YFZ features mm front disk brakes with dual piston calipers. Out back there is a single mm hydraulic disc. To handle all of the traction duties, Dunlop tires specifically designed for the YFZ were mounted on lightweight aluminum rims. Tires size measures in at 21x7x10 front and 20x10x9 rear.
The machine is equipped with a flat seat for easy rider movement. Wide 45mm footpegs with kicked up ends were installed for more comfort and control. Even the parking brake was addressed with a handy lever setup mounted on the left side of the handlebars.
Its fully ajustable shocks reward aggression with a firm responsive ride. Updates for With the only complaint about the YFZ being that the machines suspension and seat were a little stiff, Yamaha went on a quest to soften things up just a bit for They backed off on the preload settings a bit on the front shocks, making the front a bit more compliant on small bumps.
Reducing the front end preload also reduces the machines ride height a bit. This should help reduce body roll in corners. The seat got new foam and a gripper cover. The 04 seat was harder then the plank on captain hooks pirate ship, neither of which we want to have anything to do with. The new seat foam was a welcome change.
For further weight savings and perhaps extra strength, Yamaha switched out the steel rear brake and shifter from last year for lighter aluminum components. There were also rumors about some updates to the electrical system, minor updates to the transmission, and beefed up swingarm, however Yamaha is not claiming these changes so we cannot substantiate whether they are fact or fiction. For legality, we installed a set of white number plate backgrounds. While the YFZ comes with plastic heel guards, we splurged for the extra strength and bling factor.
To put our YFZ through its paces we chose two test riders with very different riding styles and skill levels. Chris Earlywine is a pro level cross-country racer and expert level motocrosser. ATV Repair Manual is produced and published by many all- terrine vehicle companies so as to help technicians and qualified mechanics to service and maintain their off-road vehicles. It is recommended that technicians who use these repair manuals should have the necessary understanding of the repair procedures and mechanical ideas.
Yamaha YFZ ATV manuals consist of chapters which are easy to understand and are followed by repair procedures accompanied by quality photos, illustrations and diagrams. ATV repair manual contains the following chapters: general information, maintenance, precautions, engine, fuel system, suspension, driveline, fuel system, brakes, and transmission, electrical, body, wiring diagrams, accessories, and troubleshooting.
It is therefore written for persons who have the skills and tools which are required to service all terrine vehicles. This means that persons who do not have adequate knowledge to service and maintain these vehicles are assisted by an authorized Yamaha YFZ ATV dealer.
A repair manual helps to show how to take the machine apart, repair it and later put it back together. It is written in well specified and detailed information which mechanics can understand. This service manual is used interchangeably with the repair manual. Shipping help - opens a layer International Shipping - items may be subject to customs processing depending on the item's customs value. Your country's customs office can offer more details, or visit eBay's page on international trade.
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