Year 2001 Yamaha YZ426F —

13 Фев 2015 | Author: | Комментарии к записи Year 2001 Yamaha YZ426F — отключены
Yamaha YZ 426 F
Yamaha YZ 426 F

. and Titanium for All!

Photos by Kato Kariya

Torrance, October 27, 2000 — may pride themselves on being the the acknowledged four-… technology but it’s Yamaha that has the world’s first production with titanium valves.

The (and its soon-to-be-released counterpart, the will feature Ti valves in of the previous steel items. The Lighter weight equals reciprocating mass which quicker revving and higher rev that culminate in mo’

A few grams off of a valve (of which are five in Yamaha’s Genesis may not seem like a big deal, but your high school course: force equals times acceleration. Given if an equal force is applied to two the lighter object will quicker and, hence, be to achieve a higher theoretical top (velocity).

As we have seen in F1 and such, a light valve (going as far as pneumatic valves) extremely high revs and, consequently, more all else being equal, of

That’s not to say that steel don’t still have a in this cruel and unusual we live in. It’s just — where performance is — using Ti valves has been a staple of performance in almost every form of combustion. And when you’re to extract maximum output a given displacement (as with single cylinder motor by the AMA’s rules of competition), little bit helps.

Other than the valve there were other made to last year’s (which replaced the YZ400F the before that) in the search for a bike.

The crankshaft has been and the whole assembly has been for quicker throttle response Yamaha claims, less horsepower loss. The carburetor has tweaked to provide smooth and a more linear throttle across the board. What is a heap of power if you can’t it, after all?

In addition to mods, a few changes were to the transmission to help contain the and ensure longevity. The suspension has received a bit of an overhaul with the being reduced weight and action throughout the ….

gets ready for a landing. and chair-backs in the upright position

After spending some on this bike at a few tracks it’s safe to say that, as as last year’s bike the new 426 is even better —

Ridden back-to-back with year’s bike (even the new old we sampled) the titanium valves among other things do make a difference. The first you notice upon start-up is the new bike sounds much like it revs more than before.

Out on the track, the 426F is much more than any other thumper thrown a leg over. The power of a more traditional four-… put a large amount of grunt in the rev range before building a solid midrange that off into a mellow top end with over-rev. This Yamaha, could not be more different.

power on this YZ is superior to of a 250cc two-…, and it only better from there. The snaps into a healthy before pulling into a that cuts in just every living creature a five mile radius has a …. This motor wails and nobody will it for a Honda XR600, or even a KTM

When traction is plentiful, the snap is a big plus. This is true on more Supercross-inspired where instant throttle and bark out of corners are what that you land safely on the side of the triple jump. On a hard-packed surface where are more prone to slipping and around, last year’s mellow power delivery however slight it may be — easier to manage.

Still, the snappy delivery of the new motor is to control than a typical motocross bike. The throttle with the new carburetor settings is precise. Mid-corner throttle were crisp and allowed us to the bike’s line without catching us off guard with an hitch or hit in the flow of horses to the wheel.

The new carb’ settings make the 426F easier to to life. Once you learn the procedure (prime the cylinder, bring piston to just top-…-center before giving a push through the …) the starts first kick, or hot, thanks to the hot-start on the carburetor.

The only time we had a problem the bike is when we ran out of gas on the back of the track and had to … some 100 race gas from somebody to get to our pits. It was here that we of the 426F’s dislike for race It was much happier running 92 pump gas.

Yamaha YZ 426 F
Yamaha YZ 426 F

Fuel aside, the gas tank is reasonably and allows good fore/aft while providing something shaped to hold onto your knees. In fact, the ergonomic package on this YZ is thought out. The handlebars a nice bend to them and are for good rider control and

The footpegs are well-made units a wide platform and sit in a position keeps them from in ruts without cramping a legs.

That same that supplied the plush through the chop also did a job of keeping things from out of sorts on hard landings. last year’s forks occasionally produce a metal-to-metal when bottoming, the new forks emitted such sounds when we overjumped or came up on the various obstacles.

We ran the bike with 98mm of sag in the and never had to fiddle with the As delivered, the suspension settings are good for a number of riders. we did break out the tools, we were to make things work still, but only slightly.

The suspension is that good.

to the Year 2001 RM250 we had on the Yamaha was a Cadillac of sorts. the RM would shake its head a bit on the and choppy straights, the YZ-F thunder through, seemingly any undulations underfoot. The tradeoff of course, that the Suzuki was to turn inside of the Yamaha effortlessly.

Keep in mind the new RM250 weighs considerably than the four-… and is one of the sharpest-turning weapons we have yet to sample. still, this only that the thumper pilot had to use a bit muscle to initiate and hold a line through a corner.

A powerband and predictable handling viscous berm-surfing. So, if you have an old 2000 YZ426F, should you run out to your old steel-valver with a bit more modern, blessed titanium valves? Not quite.

There is a noticeable difference the two bikes when they’re hard. But as the case often is, the rider that’s going to the difference. It’s just now the rider has an even more tool at his (or her) disposal.

It that the best four-… weapon on the market has just better.

Yamaha YZ 426 F
Yamaha YZ 426 F
Yamaha YZ 426 F
Yamaha YZ 426 F
Yamaha YZ 426 F
Yamaha YZ 426 F
Yamaha YZ 426 F
Yamaha YZ 426 F
Yamaha YZ 426 F

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