YZ250 WR Gearbox Conversion // YZ Enduro Build - Part 4

Build Starts at 1:35
Today we're working on a crucial part of turning out YZ250 into a offroad machine. We're going to try and install a wr gearset into our YZ gearbox! The gears came from a 2002 wr426, and there's a little grinding to be done in order to make these new cogs fit into their new homes.
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[@TheShredist]

I misspoke in the video. The doner gearset is from a 2002 wr426, not a 2003!

[@gordonstimmel4590]

You still messing with that bike?

[@gordonstimmel4590]

It doesn't work in fifth

[@gordonstimmel4590]

I played this game I promise certain things doesn't work correctly.

[@TheShredist]

It works perfectly. I did a 3 hour hare scramble on it and 5th is super tall now.

[@jajakfb9817]

How come the build series stopped is it coming back?

[@Crucifiedego]

That cardboard layout hack is.... Genius.

[@robertreyes6613]

I put a wr trans in my 01 yz250f best mod I’ve done aside from putting a stronger 03 crank in it,hauls

[@Leo_Inclan]

SUPER excited to see the rest of this build! Keep 'em coming!

[@toady..9833]

good vid bud, i just got a wr450 box for mine, going do do the squish and re cc the head while its being stripped down

[@inhalethetrail3935]

my dude where you at? Hope your doing well.

[@genisis53]

“They shouldn’t blow up… but you never know” is how 100% of home mechanic jobs go

[@edriley1516]

That cardboard template idea and putting the bearings in the freezer is nothing short of pure genius!

[@lespaullen]

Nice video!!! One trick I have learned along the way is to use an ink roller to apply the liquid gasket. It is how they apply it at some assembly factories like Rotax. It works great, a nice uniform application and it stays out of your dowel holes / threaded holes.

[@TheShredist]

That is a super great trick! I'll have to try that next time around. Thanks!

[@lespaullen]

@@TheShredist Heck yeah, works great on diff covers etc., you will be addicted to it lol

[@gordonstimmel4590]

Fifth gear doesn't work right

[@chadrides914]

Great stuff man I much enjoyed this. Good luck with the project. I absolutely despise re-assembly of the trans and shift forks and cam!

[@christianpeters6579]

I’ve always wanted to do this to my bike, but I’m too worried I’d put it back together and still have extra parts that I forgot went back into the assembly. If/when you do a carb rebuild I’d be super into seeing that process. Probably something a few of us could learn from.

[@noobFab]

Fear not, I believe the process of selectively removing parts during the upgrade process is known as 'weight reduction'? A laudable approach for any self-respecting modder!!

[@theblishknovk]

This vid is awesome! Great xr action!

[@64maxpower]

I think it's crazy how parts swap between the 2 and 4 stroke bikes

[@gordonstimmel4590]

Not really I fucked around with this shit show what a fucking mess and fifth gear doesn't fucking work

[@aaronwaderides7209]

Great video thanks I’m excited to see it all together and you ripping it on your property.

[@piotrwaszka3491]

hi just rebuilding yz 250 and thought wr gearbox, my question will the 2003-4 gearbox from wr450 fit yz?

[@PeterCPRail8748]

Nice rebuild. Going to make for a fine smooth runner when she back fully togther again.

[@toddblewett319]

Been waiting for this series FOREVER!!! Stoked that you’re working on it again! Nice work 👊

[@gordonstimmel4590]

It doesn't work!!!!

[@krazed0451]

Tidy work! Got another video on the way soon? :-)

[@josevelez49]

What was your final gearing (sprockets)?

[@yamaha4902]

Where it at now?

[@mattjames8320]

If anyone has trouble sliding in the bearings you can throw the block in your oven, with the bearings in the freezer and that’ll help

[@GeorgeLoch]

Welcome back to the KZbin office :)

[@TheShredist]

Its been a minute! Lol

[@YanDoroshenko]

Can the bolt hole still bring trouble by creating some sort of turbulence in the oil when the gears are spinning?

[@TheShredist]

I've had the thought, but I guess we will find out!

[@clayboi6939]

the spinning gears will create far more turbulence than the small bolt hole.

[@theenduropest]

love it man! sick channel, MTB and Bikes, Yewwww!

[@noobFab]

I love the intro shot... it's snowy mid june at Shredist HQ. S'been a while ;) Interior garage shots look stellar - those lighting and camera upgrades are paying divdends! Been waiting for this. Thank you! Hope Sarah's new venture is going well !?

[@TheShredist]

The venture is going very, very well. News on that soon lol

[@gordonstimmel4590]

​@TheShredist it does not work

[@jared2473]

Awesome video! How do the gear ratios of the 2002 wr426 differ to that of the stock YZ250 and the YZ250X? I've got a YZ and YZX and both transmissions could do with some tweaking. I'd love the YZX 3rd in the YZ and maybe the YZX 4th to replace the 5th in the YZ, giving the YZ longer legs and a more usable 3rd. While in the YZX, Id like 5th to not be so long, and possibly even 4th. I love both bikes, but both bikes have their floors. I'd appreciated you opinion and keep up the good work!!

[@TheShredist]

I only got one ride before the snow came, but the wr set in this bike is amazing. Went back to factory yz gearing with the sprockets (i had been gearing down to compensate for the tall first) and the wr 1st can crawl as low as you need now. Spread seems very even throughout the gears, and I wasnt able to find the top of 5th on the straights like I did with the yz trans and geared down sprockets. Again I need more seat time on it, but I think this should definitely be the gearset yamaha puts in their offroad models, its amazing in the woods now.

[@jared2473]

@@TheShredist awesome man! Do you know if the gear ratios of the wr are different to that of the yzx' 3rd 4th and 5th?

[@TheShredist]

@@jared2473 i do know they are slightly yeah, not sure exactly what they are. I found that info digging into some forums, but the wr has a more even spread than the yzx, which is one of the reasons I went this route.

[@jared2473]

@@TheShredist I appreciate your comments. the WR gear box sounds exactly what I'm looking for. ill dig a little deeper. cheers

[@gordonstimmel4590]

It's been a interesting rodeo with my wr300yz

[@XJonAye]

Whats up man, how did it turn out?

[@kevinjohnson162]

This is a sick build!…I wanna replicate it on mine. You should make and sell those Bull bar brackets

[@gordonstimmel4590]

The wr426 transmission doesn't fucking shift right fifth gear doesn't work right its not worth the trouble

[@3XTS]

This video helps me a lot since I want to try to do the same on a 2017 YZ250F. I have already installed the heavier flywheel and went to a 48T rear sprocket and she rides really good for trail rides! Want to try to get a WR or FX tran gears to make her 6 speed instead of the 5 speed MX tran. Any suggestions?

[@gordonstimmel4590]

Just buy a fucking ktm I threw a few hundred away finding out why it doesn't work.

[@3XTS]

@@gordonstimmel4590 I already own a Husky TE300. The YZ is a project bike just for fun.

[@64maxpower]

Since you have the grinder out maybe match the cases to the transfers

[@fmxr47]

Not trying to correct but want to ask. was the gear set from a 03-05 450 or from the 01-02 426. 2003 was when the 450 was introduced and the 426 ended in 2002. Figured this may be worth mentioning incase anyone tried to follow the same path as you and may ende up with the wrong parts. I'm not sure if they changed transmissions between the 450 and 426 though.

[@TheShredist]

You're right, I misspoke, it's from a 2002 wr426

[@gordonstimmel4590]

I'm playing this game lol

[@gordonstimmel4590]

With my Athena 300 in fifth my clutch slips bad but I am changing a couple things there is a fix fir the clutch just 400 dallors I'm waiting on but I have a beast of a Yamaha that can pass a ktm crazy stuff anyways been through a lot with this headache lol.

[@scottpink2013]

for sure a lost skill.....its amazing to see you build this at home. can't wait to see you rip it around ur property and tear up the yard!

[@gordonstimmel4590]

Did u ever get it done???I did you got clutch problems coming lmao.

[@streetrage8694]

Nice

[@MrJulianguillaume]

Where is part 5 ?

[@TheShredist]

Soon! In the next few weeks as life permits 🤘

[@gordonstimmel4590]

​@TheShredist yeah what's going on do u need me to show them mine lol.???

[@gordonstimmel4590]

And then it doesn't shift into fifth when its running

[@tanopol5886]

please dont do part of the build of camera!

[@Gustavo_enduro]

Nice