Mr. Robinson's Forum Activity

Reply to Does anyone know when to expect 2022 YZ250FX's to arrive in dealers? 9/25/2021 7:22 AM

Yamaha says they are supposed to be available in October.

Reply to KOK blue seals vs SKF green fork seals 9/23/2021 1:58 PM

Well... I got some today. Not much to say, really. They look like fork seals.... I like the blue, it should go good on my Yamaha "because blue is better", but we all know that.

w00t
Now it's the test of stiction and time, to see if they are really ... more »
Reply to Rim Lock Placement 9/20/2021 6:04 PM

I always run my rim lock 4 spokes from the valve stem. In the case of a dirt bike with the rim lock, the yellow dot should probably go with the rim lock. Below is supposed to apply to auto and street bike tires; Uniformity Method (Red Mark) When performing ... more »

Reply to YZ85 cylinders / serviceable cores 9/20/2021 3:46 AM

Still have these.

Reply to KOK blue seals vs SKF green fork seals 9/19/2021 2:45 PM

Anybody ever get any of these to test out?

Reply to YZ Leaf spring mid valve conversion 9/18/2021 10:49 AM

Yeah my bad. I know they don't make a conversion, but I was thinking that was the cup they used on the post. I didn't realize it was integrated into the post, I thought is was removeable. Just a senile old man.

Reply to YZ Leaf spring mid valve conversion 9/18/2021 8:01 AM

The SDI "valve stopper", as KYB calls it, is close to yours, but much different than the one used in the F's. The SDI is 20mm OD and 18mm at the bottom of the cup and only .030" deep. But, has a sleeve recess in the top and and no relief in the bottom.

... more »
Reply to YZ Leaf spring mid valve conversion 9/17/2021 6:48 PM

Yeah I really don't think I want any preload on the stack, but at this point I'm not for sure. I guess the first set up will more or less be a crap shoot.

Reply to YZ Leaf spring mid valve conversion 9/17/2021 3:43 PM

The interesting thing is my bike is set up pretty much like yours. I'm on .47 / 5.6 springs with the '09 F swingarm and 143.5 linkage, but I'm about 180#, riding all XC stuff. I like a more active and plush suspension in the first part of the travel ... more »

Reply to YZ Leaf spring mid valve conversion 9/16/2021 5:15 PM

Great write up cwtoyota. What I'm wondering is what sort of shims stacks guys are coming up with. I have a few of the SDI cups and would like to start working with them. If the '22's have them before to long we'll know what KYB is doing for them, but ... more »

Reply to Castor 927 / A747 9/4/2021 7:00 AM

I have ran both but never above 50:1 and that was in big bikes above 250cc. 250's at 40:1 and smaller bikes at 32:1 to 20:1. Never had an oil related issues with any CASTOR based oils, really. A747 was my bench mark for years, until it got to hard to ... more »

Reply to Stic carb mod on 2020 Tm 144mx 9/4/2021 4:41 AM

So now there is a "B" tube? What's different about the "B"? As far as the straight section diameters are concerned, the 113 / BLUE combo is basically the same as a 114 / RED.

Reply to KXF and YZ fork innertubes compatibility 9/3/2021 12:44 PM

I think the KX tubes are a little shorter.

Reply to Stic carb mod on 2020 Tm 144mx 9/3/2021 9:54 AM

I would suggest going to the blue needle and 3.0 on the air screw and see what that does for you. You may have to drop a main size with that. The air screw is a big tuning factory with the STIC. Normally when you get them dialed you can make all your ... more »

Reply to Stic carb mod on 2020 Tm 144mx 9/3/2021 3:48 AM

Are you running a 113A tube with the RED needle?

Reply to 2021 YZ250 Flywheel weight 8/4/2021 6:16 PM

I downloaded your spread sheet a while back and it's pretty cool. Thanks. Funny thing is ( if I remember right ) some of the manuals differ in what they say the stock timing spec should be. I'm thinking some of them spec like .0070" and others are like ... more »

Reply to 2021 YZ250 Flywheel weight 8/3/2021 6:08 PM

The stock squish clearance on the current YZ250's runs about .074". Simply getting down to under .055" makes a huge improvement, if you put the volume back. I like about .042" to .045". And yes, you can run pump gas that tight, especially if you ease ... more »

Reply to 2021 YZ250 Flywheel weight 7/31/2021 7:16 PM

I've set a few YZ's up with the "X" CDI ( better than retarding the timing, IMO ) and "X" power valve spring mod, along with lowering the compression with a head cut. Really smooths out the power and adds some rev's. I also love the DEP pipe and shorty ... more »

Reply to XC / offroad racing in the Wichita, KS area. 7/28/2021 2:03 PM

Good information guys. Thanks a bunch. An hours drive is pretty comparable to what I have to do now just to ride. Racing is 1 to 3 hours, sometime a little more. So that's pretty comparable to what I'm doing now. Very cool.

Reply to Kick a** two strokes! 7/26/2021 2:38 PM

Now that's cool.