yz450f difference


17 replies to this topic
  • waipuk78

Posted September 07, 2009 - 12:14 AM

#1

how can you tell the difference between an 04 and an 05 bike

  • Sider_steve

Posted September 07, 2009 - 12:40 AM

#2

The graphics were different,but odds are the stockers are gone by now.
On the 04 the front brake line wrapped under the fronk fork leg.

  • waipuk78

Posted September 07, 2009 - 02:02 AM

#3

is there any engine differences?

  • Sider_steve

Posted September 07, 2009 - 02:13 AM

#4

Slightly different compression ratios the 05 was 12.3:1 the 04 slightly higher at 12.5:1.
And I dont think there were any differences in the cases or the cylinder head.
so you should be able to swap them out.

  • Geoffit

Posted September 07, 2009 - 06:38 AM

#5

all the engine parts are the same, the intake port on the 05 is the same style as the newer bikes. the main thing on the 05 is the forks which are the new twin chamber type much better then the 04 fork.

  • grayracer513

Posted September 07, 2009 - 04:04 PM

#6

The most obvious difference is the fork. The '04 has a 48mm single chamber fork, which has a standard type 3/4" male hex at the top. The '05 has the first version of the KYB twin chamber, which has a 32mm internal hex at the top.

The brake line routing is different as mentioned above.

The '05 engine is quite sluggish and "soft" compared with the '04, but that is almost entirely due to the CDI having a different timing map.

  • FinchFan194

Posted September 07, 2009 - 04:06 PM

#7

Ya what Grey said!

  • Sider_steve

Posted September 07, 2009 - 05:25 PM

#8

is there any engine differences?


Are you buying a different engine to put in a bike?
Or are you looking at an entire bike?

  • waipuk78

Posted September 07, 2009 - 05:41 PM

#9

need a new cylinderhead and have seen one for an 04 mine is an 05 going by what has been said the code under the seat has rubbed off so cant just read it anyone know where to source heads from at a reasonable price

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  • Sider_steve

Posted September 07, 2009 - 05:53 PM

#10

Is your cylinder head totally shot?

  • grayracer513

Posted September 07, 2009 - 07:01 PM

#11

The tenth character of the VIN number on the frame is the model year. For instance, a 5 means it's an '05.

Heads are usually repairable, although that can exceed the cost of new in an extreme case.

  • Sider_steve

Posted September 07, 2009 - 07:47 PM

#12

I found a few cylinder heads on ebay.
1 used one and a few new ones.
The used one has a bent valve and now I cant find it to post the link.
And the new one comes complete with sticker shock!
http://cgi.ebay.com/...sQ5fAccessories

  • waipuk78

Posted September 08, 2009 - 12:15 AM

#13

from what i have been told is the inlet cam is bent and has worn out the saddle that it sits in on one end also some surface damage where bucket broke

  • Sider_steve

Posted September 08, 2009 - 08:48 AM

#14

I just searched the net by typing new zeland cylinder head into my search engine and came up with a list of places that might be able to make your old one work.
might be worth looking into.

  • grayracer513

Posted September 08, 2009 - 09:11 AM

#15

from what i have been told is the inlet cam is bent and has worn out the saddle that it sits in on one end also some surface damage where bucket broke

Those are fairly routine repairs here in the states. Search around your area for something local.

If you can't find anything, and international shipping doesn't overrun the cost of a new head, consider Engine Dynamics.

  • davecampbell

Posted October 03, 2009 - 06:35 PM

#16

when did yamaha go to the aluminum frame for the 450? 05 06? Will the 04 or 05 head work on an 06?

  • JJRace

Posted October 03, 2009 - 06:56 PM

#17

06 is the first year of the aluminum frame YZFs. 05 was the first year aluminum frame for the YZ 2strokes.

  • grayracer513

Posted October 03, 2009 - 08:56 PM

#18

Will the 04 or 05 head work on an 06?

No. The older head oils externally. The Gen2 head oils internally.





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