Question: 2012+ WR frame?
Posted March 17, 2013 - 09:14 PM
Thoughts on subject please.
Posted March 18, 2013 - 05:52 AM
The new YZ450 frame has the reverse motor.
Secondly, it is not 'the YZ250 frame'.
It's BASED on the 250 frame, using some of it's spars and castings.
It is not the same frame.
Posted March 18, 2013 - 08:26 AM
Also, I guess I can try to simplify my request or at least the premis: Krannie's observation about the the current YZ450 engine makes good sence, but I guess barring that difference why might a coorporation choose to go with the 250 frame rather thatn the 450.
My thoughts would be for weight savings and feel. Also the fact that the WR450 typically is not putting the same forces of stress that the YZ450 frame is engineered for.
A secondary question here: Can anyone compare the YZ 2010-2013 throttle responce (big powerful hit / injection ) to that of the 2012-13 WR?
Posted March 18, 2013 - 02:16 PM
Posted March 18, 2013 - 04:34 PM
Posted March 18, 2013 - 05:29 PM
The reason Yamaha chose to go this route is everyone raved about the YZ250F handling so they figured let's shoe-horn the WR450 motor in there to create the ultimate off-road hot rod. They've pretty much suceeded. The bike is quick but that is more down to the injection than the frame...same motor as the 2007-2011 WR450F.
The handling feels lighter due to mass centralization although the bike weighs exactly the same as the previous generation. I've noticed the 2012 is not as stable as my 09....not a big deal as you just twist the throttle harder and lift the front....no more stability issues ;-).
The only real problem I have with the bike so far is it is quite cramped in the rider ergo department. I'm 6'2" and I've installed GYT-R handle bar mounts (10mm up and 5mm forward), KX-Hi bar and Fasway pegs in the low-boy position and the bike is still cramped. Obviousy a direct result of starting from the 250. Looking for more ways to open it up a bit. If anyone has any ideas I'm all ears!
Other than that I'm pretty happy with the bike. Just orderd Dave Simon's intake cam so we'll see if it's all he claims it to be (I hope it is). 5hp in the middle and up sounds pretty damn good. Hate to lose the bottom hit in the process but he assures me it doesn't affect it too much. Will let you all know how it works when I get it installed.
Posted March 18, 2013 - 06:57 PM
Posted March 19, 2013 - 03:24 AM
In either an article I read or a video I watched another reason mentioned for not basing the WR on the latest YZ450f is limitations in fuel capacity.
No doubt that was one of Yamaha's concern's, fuel range.
As it is, the fuel range is on the short side for anyone that doesn't live on the East Coast.