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All Japan National MX Championship Series - 2010 News

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From: http://motocross.transworld.net/2009/03/14/exclusive-japanese-spy-photos-2010-preview/

The 2009 All Japan National MX Championship Series got underway today at Kyushu Sports Park in Kumamoto, Japan, and several special works bikes made their debut at the Honda-owned and operated facility. Because the machines of the MFJ series are not limited by a production rule, manufacturers are allowed to field prototype, pre-production, a full-works machines.

This weekend, the standout bikes were the Kawasaki KX250F and Suzuki RM-Z250s, both of which featured electronic fuel injection. Both were reported to be pre-production 2010 units, so it appears that EFI will make its way into the Lites class for 2010.

No special Yamaha YZ250Fs were on hand at Kyushu, mostly due to the fact that Yamaha Japan has cancelled its official factory motocross race team effort. The satellite Team YZ squad was mounted on stock-looking ’09 YZ250Fs. Our inside sources at Yamaha Japan, however, indicate that there are no major engine changes in store for the 2010 Yamaha YZ250F, though the bike will receive an all-new chassis and bodywork, plus revised suspension settings.

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This is amazing. Thanks for posting but what's that blue thing on the YZ's header? http://motocross.transworld.net/files/2009/03/14/464y7706.jpg

evap cannister?

464y7706.jpg

Caption from that photo:

As for the all-new Yamaha YZ450F, defending All Japan National MX Champion Akira Narita raced a privateer ’09 YZ450F (under the YSP/Narita Racing Team banner) with a combination of works Yamaha parts and Rinaldi Racing parts from Italy. Though the radically all-new pre-production 2010 YZ450F—which features EFI, a forward-tilted engine and an all-new chassis and bodywork—was said to be ready for Narita to race, word in the pits was that Yamaha Motor Corp. USA demanded that the bike not be unveiled in Japan just yet. Poor sales of the ’09 YZ450F mandate that the ’10 model not make its competition debut until September, at the All Japan National MX series finale.

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It was very muddy there. Check out this honda's "egg crate" type foam it has under the fenders.

===============

464Y7824.JPG

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That pipe on those Hondas sure look like it will smash fast????!!!!!!

Imagine looping out with the cannon sticking out the back of that Kawi! lol

kawi.jpg

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the pipe on the yamaha looks like a version of there gytr pipe.

stewart runs something that looks like that

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Matt eee us,

I believe its a resonance chamber like the ones available on the GYTR header's. It brings the decibels down.

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Matt eee us,

I believe its a resonance chamber like the ones available on the GYTR header's. It brings the decibels down.

Thanks for clearing it up. It looked too big to be an expansion can.

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is the foam just to keep it clean?!

that would be destroyed fast if it was normal production installation

so did yamaha make the smartest decision out of all the bikes to keep EFI off of there 250?

i think its okay to test it with a bigger engine like the 450.

whats your guys thoughts on it?

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This is amazing. Thanks for posting but what's that blue thing on the YZ's header?

the blue is just that .... the pipe turned blue from heat.

now the expansion chamber in front is just oddly shaped.

the real question is if the head is really a 5 valve of not. you cannot really tell that from looking on the outside and a sticker (ie dubach trick in '00) would have you thinking it *is* a 5 when it was really a 4. just like what doug did with a 400 sticker.

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i thought they used carbon fiber sub frames in 08, wonder why they stopped...

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They Yamaha is no longer factory supported. So they probably didn't have the money for a CF sub frame.

I can't wait to see the YZ450F in September. "2010 YZ450F—which features EFI, a forward-tilted engine and an all-new chassis and bodywork"

Whats the big benefit of going to 4 valves? Seems like the 5 valves might have something to do with Yamaha's undeniable reliability, they dissipate heat better .

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