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yzf450jack

4 speed to a 5 speed

10 posts in this topic

Did you change the whole transmission or just the innards?

Also, where did you get the parts and for how much?

I really want to do this... I wanted a Wr but got such a great deal on the YZ it was worth it to me. All I really wanted was the transmission too...

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I picked up my '04 YZ450 last Nov. and have been living with the 4 spd since. I decided I was going to have to sell my YZ with that beautiful motor, cuz' the tranny was not broadband enough for kind of riding I do. At the Desert Mt. Enduro this year, I spoke with Ty Davis and his mechanic about the gearbox issue, and was told Ty uses an '04 WR tranny....straight drop in. I stepped up to the counter and purchased a new tranny...shafts, gears, shift forks and shift drum. I have had other projects get in the way, but should get around to installing it within the next several weeks or so...I will post when I am done. Cost? About 650 big ones...

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Ouch! Hopefully you can get $300 or so for the used YZ tranny when you're done. Ths is definitely something I'm going to consider doing someday.

I don't suppose you'd take a buttload of pics and post them up when you do it would you?

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I just put it together last night im not finished yet The cylinder is out getting bored 2mm 470cc :thumbsup: it will be mean trail bike and it is more like $750.00 for the gear change over :devil:

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eazrider and yzjack this is great news. From everything I read on here before I thought it could only be done with the help of a machine shop and lots of $$$$. Let us all know how it works out.

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Hey, Jack :thumbsup:

Got it together, cool. Let us know how you like it once you get the engine running. $700 is about half what I would have guessed.

re: eurodog: "From everything I read on here before I thought it could only be done with the help of a machine shop and lots of $$$$."

That thread involved using the trans from a YZ426, rather than a WR450. The object was probably to use the closer ratio box, since the bike being built was for SuperMoto.

Can't wait to hear the ride report.

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Actually we fitted the 400 trans as it is the closest ratio gearset off all.

I heard from YRUS that there will be an 5th gear that works with the yz450trans but it will be a very limited availability, ie, race team only, but it still leaves the 1~4 oem ratios.

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instead of converting your yz450f bottom ends to the wr450 5 speed, one of you guys should just sell me your yz450f motor and buy a wr450 motor :awww::devil::thumbsup:

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