difference in yfz's

[miles Machine]

whats the differences through the years of the yfz

[Dr89]

usually im a nice guy and go through and list them all, but dude your not a newb here....there has been an unparalleled amount of threads on this exact thing, search dawg....search.

you will find everything you need to know plus things you never would have thought to ask :devil:

[Rappa]

Originally posted by Dr89
usually im a nice guy and go through and list them all, but dude your not a newb here....there has been an unparalleled amount of threads on this exact thing, search dawg....search.

you will find everything you need to know plus things you never would have thought to ask :devil:

Here's one thing I saw once but know one else has info on it. My question is on the carbs. I have an '04 YFZ450 jetted with 168m, 45, ncvq 4th clip, and 2 turns. I just bought an '07 YFZ450, did the same jetting and it ran way to rich. Is there a difference in any way with the carbs?

[miles Machine]

the jet needles on the older ones dont have as big of a o.d. on it.

[Rappa]

Originally posted by miles Machine
the jet needles on the older ones dont have as big of a o.d. on it.

Are you talking about the needle or the bore size that the needle sits in?

[miles Machine]

the needle

[Rappa]

Originally posted by miles Machine
the needle

O.K., but I put the NCVQ needle in the '07 so the 2 quads are exact, it's just the '07 runs way richer to the point were I now have a 165m, 42p and it runs better. Those 2 jets make a big difference so I was just wondering if the carbs were different in any way.

[daddio]

The carbs are the same in all years, it's just the jet's and needles that were different.
The 04-05 and 06-up have different heads. In '06 they went to a smaller port design, so the later model YFZ's tend to require a little leaner jetting. :D

[Rappa]

Originally posted by daddio
The carbs are the same in all years, it's just the jet's and needles that were different.
The 04-05 and 06-up have different heads. In '06 they went to a smaller port design, so the later model YFZ's tend to require a little leaner jetting. :D

That's the answer I was looking for being that my '07 runs richer than the '04. Thanks for that and how did you come up with that info? Just curios. Thanks - Rob.

[daddio]

I have 2 '04 motors and 2 '06 motors, in our racing stable.

[Brauap]

Originally posted by Dr89
usually im a nice guy and go through and list them all, but dude your not a newb here....there has been an unparalleled amount of threads on this exact thing, search dawg....search.

you will find everything you need to know plus things you never would have thought to ask :devil:

Alright. I tried searching and I couldn't find any threads.. can you please either post what words I should search or the URLs?

I have tried the following: changes / changes years / differences..... and I didn't find anything. :( Sorry for brining up an old thread too. :ermm: