It's Here...the 2010 YZ450F


1000 replies to this topic
  • mx614

Posted September 08, 2009 - 03:06 PM


Well I've been a Yammi loyalist since 1975 but I wont be buying this at least not untill the 4 valve head is proven reliable(HONDA) anyone. I guess I might as well buy stock in Titanium valves. And according to spec sheet on mxa you access the airfilter by removing seat and tilting tank backwards to rear of bike , not through radiators plastic. Just not sure about this one, but maybe everything will be ok and I can get one next year,or a used one later when the economy forces people to sell.:busted:

  • Wiz636

Posted September 08, 2009 - 03:18 PM


Well I've been a Yammi loyalist since 1975 but I wont be buying this at least not untill the 4 valve head is proven reliable(HONDA) anyone.


Just because Honda can't make it right the first time doesn't mean that Yamaha can't. The problem is/was not inherant to a four-valve design.

  • grayracer513

Posted September 08, 2009 - 03:24 PM


Just because Honda can't make it right the first time doesn't mean that Yamaha can't. The problem is/was not inherant to a four-valve design.

Absolutely true. Note that the exhaust valves have always been reliable, and they are essentially a "4 valve" design in that there's a pair of them. Honda's valve issues were simply a matter of poor execution and material selection, and never anything more than that.

  • ace402

Posted September 08, 2009 - 03:35 PM


Looks like my 05 just got that much more obsolete.

  • ThumperKid250F

Posted September 08, 2009 - 03:38 PM


i have to say i love it:thumbsup: my only thought is that how are the aftermarket tank guys ( ims and clark) going to fit a bigger tank under the seat.? maybe no more 3.1 gal

  • grayracer513

Posted September 08, 2009 - 03:49 PM


i have to say i love it:thumbsup: my only thought is that how are the aftermarket tank guys ( ims and clark) going to fit a bigger tank under the seat.? maybe no more 3.1 gal

The whole tank is not under the seat, only a portion of it. If you think about it, that's been true for quite a while. It will be a challenge, but I can see it being done.

  • jrny426

Posted September 08, 2009 - 03:53 PM


No more header to crush .....SWEET!!!

  • krony506

Posted September 08, 2009 - 03:54 PM


I know you guys keep bashing the Honda but look how lite they made the bike, I just hope it doesn't hurt the reliability.

  • mikestrutter

Posted September 08, 2009 - 04:00 PM


Posted Image

Its quite hard to see how a bigger tank is possible. it will be interesting to see how it performs on the trails

  • cord-mac

Posted September 08, 2009 - 04:04 PM


i got a good question, how do you get to the air filter? i hope you dont have to take off the seat and the tank to get to it.

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  • krony506

Posted September 08, 2009 - 04:05 PM


I found this on motocross.com and they are heading to Budds Creek to test the bike.
http://motocross.com...z450f-2646.html

  • SUnruh

Posted September 08, 2009 - 04:21 PM


No more header to crush .....SWEET!!!


honda made theirs way easier to crush and yamaha removed it entirely.

pipe makers want you to ride red!

  • SUnruh

Posted September 08, 2009 - 04:24 PM


Its quite hard to see how a bigger tank is possible. it will be interesting to see how it performs on the trails


seems to me that there is the entire area where the old air box (under the
rest of the seat) that could be devoted to the storage of fuel.

  • JSanfilippo

Posted September 08, 2009 - 04:24 PM


i hope you dont have to take off the seat and the tank to get to it.


As someone who owns a woods bike with a side access filter door, the idea of removing the seat to service the filter seems like a pain in the ass...but how is that any different from any other YZf?

  • JSanfilippo

Posted September 08, 2009 - 04:27 PM


seems to me that there is the entire area where the old air box (under the
rest of the seat) that could be devoted to the storage of fuel.


I'd be worried about heat from that exhaust.

Overall I'm excited about this new bike. Between the 4 valve head, F.I., and straight through intake shot I could see how this bike is going to have better bottom end.

  • finthat

Posted September 08, 2009 - 04:31 PM


i got a good question, how do you get to the air filter? i hope you dont have to take off the seat and the tank to get to it.


I am not sure how big a deal changing the filter will be??? mabe a couple extra bolts to remove to flip the tank up?? Looks like the filter is more of a flat automotive style, would be a faster clean job perhaps.

If the air filter access is the deal breaker on this for you see you later dude. I think the bike will have alot of things up in limbo until it gets some real world testing and hours on it and not kiss butt magazine articles and shoot outs who want advertising $$ and bikes to test.

  • srfdwg2

Posted September 08, 2009 - 04:33 PM


I wonder if "OBAMA"will pass a bill for clunker bikes!!!!!:busted:

  • Polar_Bus

Posted September 08, 2009 - 04:34 PM


Ack, 7lbs of "new" weight..... bummer. Yamaha spent so many years shaving ounces here, swapping to lighter materials there in a very effective campain to reduce weight, now they had to give a good chunk of it back. No matter where you position 7 lbs, you are going to feel it at some point IMO.

However, kudos to Yamaha for really agressively encorporating foreward thinking for us weekend racers...

I am sure the weight gain is all attributed to the EFI, the pump, the "batteryless" capacitor(s), the multiple sensors, and the ECU.

Still $8K for a dirt bike.... dam... my first brand spankin new 1988 KX125 cost me $2399 !!!

  • fastmq

Posted September 08, 2009 - 04:40 PM


lets see 8k out of my wallet thats probably what half a pound (1 dollar bills) the rest i can loose by hiting the gym

  • CanadianWR450

Posted September 08, 2009 - 04:52 PM


I'd be a lot happier if they also changed the 2010 WR.....but....they didn't

Always next year, and by then... assuming the WR gets the changes...it really won't be a fist year bike anymore, and we will know how it works....actually....the WR a year behind might be a good thing for us WR guys....lol

All kidding aside though, I can't wait for the first real world test ride reports start coming in from other TT'ers





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