125-200cc WR125 Teardown in 8 seconds flat, (Caution: Bike Porn)

[PC.]

Both mine and Blake's carb measured at 37.7 (or something close to that) and my carb came off a 1999 kx125, which I've verified came with a 36mm PWK 'shorty' carb. And my buddy owned the 99' kx125, so there is no doubt about its origins. I have a couple PWK 38's, but dont want to remove one just to measure, so I haven't checked it against those, but I'm 99.9% sure my 36mm carb measure at 37.7.

Time to quote myself.....
I pulled the PWK 38 from my Yamaha and did some comparing.

PWK 36 (1999 kx125)
small end ID to ID 37.7mm
Big end ID to ID 52mm
Lip to lip (length) 75.8mm

PWK 38 (2006 yz250)
small end ID to ID 38mm
Big end ID to ID 54mm
Lip to lip (length) 75.8mm

Small differences, but different none the less.
Length on both was identical, so I guess my yamaha carb is a shorty too!?!?

 

[Blakelpd5]

You guys that can ride are killing me.

Someday!

Later,

Jake, we've never really ridden the trails together... I've been on a couple "bigger" trail rides with you, but looking forward to getting out on the trails with you... Hurry UP****************************************

Actually you had a light kelly... To bad it didn't work blake, I'm ready, need to coordinate with my pal james cause I'm directionally challenged to say the least. Jake and I could run 30+ miles in an evening and be done by nine.

I was talking to Kelly, and I know he can speak for himself, but he seemed interested as well... Let's look at next week maybe?

 

[Sparked]

.....
Flip it over, and pour your prefered oil in........

Thank you for posting the description of the shock rebuild.

A question: what sort of oil did you use, and how did it work for you? I want to try revalving mine and would like to avoid doing a bunch of rebuilds to get the oil viscosity right. BTDT with another bike, that was enough.

 

[Blakelpd5]

Thank you for posting the description of the shock rebuild.

A question: what sort of oil did you use, and how did it work for you? I want to try revalving mine and would like to avoid doing a bunch of rebuilds to get the oil viscosity right. BTDT with another bike, that was enough.

It was 5wt, I think Bel-Ray.... It seems to work great now that I put the spacers in the swing-arm correctly. There didn't seem to be anything wrong with the shock before servicing, just wanted to freshen it up.

Livin in the Beav eh??? What do you ride?

 

[Blakelpd5]

Update:

About 30 hours on the bike since this mod, and they are holding up great!!

Anyone else tired of the stupid stock bleeders on the twin chamber Marzocchis? I'm always worried about loosing the tiny rubber caps, and on top of that, getting some dirt stuck down in the valve, So, I eliminated them, and put in some Motion Pro micro bleeders.




Install Bleeders

And another view!


This is a learning experience. I hope the JB weld will hold. Seems to be pretty good so far. I'll see how it holds up on the trails. If it fails, I will fill the hole back in with JB Weld, then drill and tap it through the metal somewhere..

 

[Sparked]

It was 5wt, I think Bel-Ray.... It seems to work great now that I put the spacers in the swing-arm correctly. There didn't seem to be anything wrong with the shock before servicing, just wanted to freshen it up.

Livin in the Beav eh??? What do you ride?

Thanks.
I just bought an '11 TE250, mostly ride in Diamond Mill/Jordan Creek. I put the fat boy springs in it and the back either has no traction or kicks depending on where the clicker is set.

 

[Motosportz]

Thanks.
I just bought an '11 TE250, mostly ride in Diamond Mill/Jordan Creek. I put the fat boy springs in it and the back either has no traction or kicks depending on where the clicker is set.

How stiff of springs? maybe the spring is overwhelming the rebound.

 

[Sparked]

How stiff of springs? maybe the spring is overwhelming the rebound.

6.0 Yeah, just a bit. I found a bit of a surprise in the shock, I'll start a separate thread for that in a bit.

 

[PC.]

ive got a stock wr300 shock spring in my garage. i think its a 5.4.
Feel free to try it out.

And the shock is easy to work on. much easier than a kyb or showa imo.

 

[pahusky]

So, in getting the bearings out of all the linkages, swing-arm, and upper shock mount, There isn't much to say about style, more about the tools used to complete the job... I used several methods to get the 12 bearings that I pulled... The first method, Hammer and punch from the inside out. Nothing on anything... Lots of PB Blaster used, and soaked overnight...

Method 5... at least for the linkage; which you can't press the bearings out of because of a ridge between the bearing...

Check the price of a new linkage arm, complete with bearings! Didn't find this out until we bent one. Has the oem bearings already in it, which are much better bearings than you get in the aftermarket kits. I can't remember the price but it was resonable, I think...

Not sure about the rocker arm.

The first time I ended up with the slice method...but used a Dremel tool.

Good luck.

 

[Sparked]

ive got a stock wr300 shock spring in my garage. i think its a 5.4.
Feel free to try it out.

And the shock is easy to work on. much easier than a kyb or showa imo.

Thanks, but the 6.0 gets the sag numbers just right. The 5.2 (I think that was the stock rate) was way off for me. And you're right, it was really easy to work on.

I started a thread about shocks over here:
http://www.cafehusky.com/threads/diy-tuning-the-sachs-shock.23893/