yz450f difference

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

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.

is there any engine differences?

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.

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.

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.

Ya what Grey said!

is there any engine differences?

Are you buying a different engine to put in a bike?

Or are you looking at an entire bike?

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

Is your cylinder head totally shot?

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.

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

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.

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.

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

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

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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