It's Here...the 2010 YZ450F

[MOTOPHILE]

I wonder what sort of metal they have that's translucent.

Must be a stone age metal polymer from the Mongolian NASA program.

I think the bulb at the beginning of the header helps to drop the sound a couple decibels, like the cylinder style on some bikes... Maybe...

[grayracer513]

are 450 that thirsty?

A 450 will get roughly 20-26 mpg off road. When my son had a YZ250F, the joke was that it didn't use gas.

[erickdj]

14-volt 110-watt stator!! I'm hoping that new stator can be retrofitted on the 06-09 yz450's.

[steve_97060]

No matter what, you have to give yamaha some serious props for all these radical changes from the current MX bike norm...

[nori41]

Blue not Red though huh

[Aka.Goose]

Blue not Red though huh

First time I've liked the blue over the white...

[gravelfreak]

Actually, it's about exactly that. Offsetting the cylinder as has been done here clearly reduces piston skirt thrust. It also allows the use of a shorter rod while maintaining the less acute rod angle of a longer one, which is about piston speed, as you say. Longer rods are generally a better choice for high RPM power, as is a more over-square engine (bore larger than stroke), which was also done here. Offsetting the bore is another way to arrive at the same result.

Discussion of rod length/angle (section 3 of the post): https://www.thumpertalk.com/forum/showthread.php?p=6844321#post6844321

You're right, but I'd think it allows longer cam overlap and buch of other benefits. Don't know how they exactly affect the overall process, but it's clear that they're done together with tuned intake and exhaust. At least after market pipe manufacturers have to work for their money now

ps. HID lights need battery to light up. No alternator can alone provide enough current.

[Sycamore]

Good looking bike and major changes..I'll bet it's a winner for sure. Just wish it had a few more pounds taken off. Still, hats off to yamaha.

[motovita]

Usually FI means metal gas tank. Thats a couple pounds right there. And I do wonder about the hotseat...?

Aluminum is metal, and it's lighter than plastic.

[adamdf]

^^im pretty sure that even with 7 pounds gained, the weight has been shifted around, lower in the chassis, for better handling and an overall "lighter feeling" and more responsive machine.

[KtmKramer]

It's still 5 lbs lighter than the kx and a couple less than the rmz.

Good looking bike and major changes..I'll bet it's a winner for sure. Just wish it had a few more pounds taken off. Still, hats off to yamaha.

[Family Man]

I like the blue better two this year. yeah i bet the bike feels lighter too, even though it weights more. Thats most of the reason why two strokes feel so light.

[umu24013]

ps. HID lights need battery to light up. No alternator can alone provide enough current.

..Or a big DC capacitor

[motovita]

The stator looks to be fully wrapped. 110W is good for two 35w HID

However, looking at the reg on the bike, I bet the bike is setup to run on AC only. If that is the case, there goes the HID as they need DC power only.

I wonder if the bike can be wired for both? or just DC?

You might want to leave a few of those watts available to run the E.F.I.

[twenty34]

MSRP* $8,090 (White/Red) Available from September 2009

$7,990 (Team Yamaha Blue/White) Available from September 2009

Engine

Type 449cc liquid-cooled DOHC 4-stroke; 4 titanium valves

Bore x Stroke 97.0 x 60.8mm

Compression Ratio 12.5:1

Fuel Delivery Yamaha Fuel Injection (YFI), Keihin® 44mm

Ignition CDI

Transmission Constant-mesh 5-speed; multiplate wet clutch

Final Drive Chain Drive

Chassis

Suspension/Front KYB® Speed-Sensitive System, inverted fork: fully adjustable, 12.2-in travel

Suspension/Rear KYB® Fully adjustable single shock; 12.4-in travel

Brakes/Front Hydraulic single disc brake, 250mm

Brakes/Rear Hydraulic single disc brake, 245mm

Tires/Front 80/100-21-Dunlop® D-742FA

Tires/Rear 120/80-19-Dunlop® D-756

Dimensions

Length 86.3 in

Width 32.4 in

Height 51.6 in

Seat Height 39.3 in

Wheelbase 58.7 in

Ground Clearance 15.0 in

Fuel Capacity 1.6 gal Just like Honda

Wet Weight 245 lb???

[Wiz636]

This is kind of cool:

[Sider_steve]

^^im pretty sure that even with 7 pounds gained, the weight has been shifted around, lower in the chassis, for better handling and an overall "lighter feeling" and more responsive machine.

I wonder what the capacity of the new fuel tank is?

I doubt its going to be that much bigger, being a race bike.

But the aftermarket tank guys better get out their shoe horns!!

[Aka.Goose]

Hats off to Yamaha...They started a buzz, threw in some humor, and delivered one bad a$$ bike when they said they would...

I would totally buy one if I wasn't so freaking happy with the one I've got!

Definitely in a few years...

[KtmKramer]

Fuel Capacity 1.6 gal Just like Honda and Suzuki

Wet Weight 245 lb??? = Curb weight or ready to ride weight.

[Crazyzilla]

dry is 234. 245 is wet weght