Posts
223
Joined
3/24/2015
Location
Statesville, NC
US
Fantasy
1295th
Edited Date/Time
9/22/2022 4:03pm
Once I saw that Yamaha fixed the rider cockpit on the 250 I knew I would have to get one. It took a little longer than normal to get ahold of one but Ryan at Lojaks was able to hook us up. After owning a '08 and a '15 we knew exactly what we wanted to do to this one. Once it was brought home it was stripped to the frame immediately to have the cylinder, head, crank, and transmission sent out to Tom Morgan for some help. The suspension was sent to Art of War for a revlave and some coatings. Everything took about two months to get together but here she is.
Mods:
2022 Yamaha YZ250
Tom Morgan
Ported and polished cylinder and head
Balanced crank
Polished transmission
Art of War
Revalve
DLC coated lowers and shock shaft
Larger shock bladder
FasterUSA Wheels
DID STX Rims
Magnesium Color Hubs
Excel Spokes
Xtrig ROCS Clamps
PC Pipe and Silencer
Vforce Reeds
GYTR Clutch Cover
Light Speed Carbon Ignition Cover
Raptor TI footpegs
Core Braided lines front and back
Galfer solid mount front rotor
Rear brake pedal and snake
Guts seat cover
Vortex Sprockets and RK chain
Works Connection axle blocks and TI adjuster bolts
Works Connection Clutch perch
Pro Taper Evo SX bars
Acerbis Hand Guards and Plastic
Acerbis Chain Guide
MXGraphics.co graphics kit
DT1 Air filter
Mods:
2022 Yamaha YZ250
Tom Morgan
Ported and polished cylinder and head
Balanced crank
Polished transmission
Art of War
Revalve
DLC coated lowers and shock shaft
Larger shock bladder
FasterUSA Wheels
DID STX Rims
Magnesium Color Hubs
Excel Spokes
Xtrig ROCS Clamps
PC Pipe and Silencer
Vforce Reeds
GYTR Clutch Cover
Light Speed Carbon Ignition Cover
Raptor TI footpegs
Core Braided lines front and back
Galfer solid mount front rotor
Rear brake pedal and snake
Guts seat cover
Vortex Sprockets and RK chain
Works Connection axle blocks and TI adjuster bolts
Works Connection Clutch perch
Pro Taper Evo SX bars
Acerbis Hand Guards and Plastic
Acerbis Chain Guide
MXGraphics.co graphics kit
DT1 Air filter
Any idea what that bad boy weighs?
The Shop
Also how do you like your TMR power plant? He did my engine as well. I still have my crank I need to send him to balance as that noticeably helps the revs & subsequently reduces vibration.
Haha, pretty much but the rotational mass of the 250 will always keep the 125 just a little more flickable & light on its feet I think. If I get super motivated I may put the 125 on a super diet one day too & see what I can get out of her. Maybe have ole Tom build me a 134.
Yeah man if you like that upper rpm range then you definitely benefit from that balanced crank! That’s awesome he can get it better than a 17+ KTM with the counter balance.
You need to give us some ride reports on the new bike, how is she?
Did he say leaner on the pilot & richer on the main? FMF pipe & silencer for overall performance... I believe that is what he sends over but it has been years since I looked as his paperwork.
You remember where you ended up? I went to a #8 slide (stock is #7 IIRC), leaner on the pilot & LEANER on the main as well. Never understood the richer main with a stronger intake pulse from porting & increased port duration to pull more fuel. Now if you run T2, u4.4 or MRXo2 yeah, 100% go richer but most of the time with a big bore or good porting you can lean up. Maybe he is expecting us to run the good gas / highly oxygenated stuff 😎
Same with the pipes, I offered to send him 3 of my euro pipes to test but he didn’t have a yz at the time.
What did you go with a 51 tooth rear? I would definitely run the 50. I’m even thinking of dropping down to the 49 when I rejet for u4.4 & after loosing 20lbs of the bikes weight.
Love mine also.
I am running a 49 rear to get more top end on some of the bigger tracks that we have. I will probably switch between a 49 and 50 depending on the track.
What main did you run, 175,172?
Looks like we are both on the same page for gearing 😎
His bike is on point
Hey mate, great build.
I picked up my ’23 YZ250 two weeks ago 😊
After over 30 years of riding/racing this is my first Yammi and first set of KYB SSS suspension and I’m really impressed with the stock platform. After 3.5 hours on it, I’m loving the old school 2-stroke power/character and the suspension is starting to break in and give plenty of feel/control.
I’m about to undertake a similar build with mine and had a couple of questions if you don’t mind:
- Just wondering if you have had any experience with linkage arms – I noticed you haven’t gone for one on your YZ, keen to understand why not?
- Would be keen to get your thought on the benefit the triple clamps provide – they are a big cash investment. Keen to get your thoughts on the feel/benefit to the YZ250?
- Galfer solid mount front rotor – why did you go solid? I have noticed the stock front on my ’23 grabbs and causes the front to tuck/buck under harsh braking. Have you had that sensation with the solid rotor and the braded lines?
- What Vortex Sprocket ratios are you running?
Thanks heaps
1. I didn't feel the need for a different linkage. I like where the shock sits and how it reacts. My only complaint with the rear end is the stock tends to want to overheat and it loses some compression late in a moto.
2. A couple of things for the clamps. I do feel like they help take some rigidity out of the bike and they look badass. I also like bar mounts for some vibration damping.
3. I find the stock Yamaha brakes on the weak side. I like a strong initial bite and the solid rotor gives a much better feel. I may even experiment with a Brembo master like Keefer has done in the future.
4. I'm currently running a 13-49. I have bounced around on this tho. I am also on my third pipe/silencer combo. I feel like a 13-50 with the DEP pipe and silencer would be better. Let me get to third a little sooner and not have to be shifting in between jumps as much.
Pit Row
Thanks for the info jpatz.
Ran into some issues on '22. The power valve shaft had a manufacturing defect that caused it to break in half. The middle valve edge then caught the piston and shattered the skirt. I rebuilt the motor and replaced all the bottom end bearings re-did the top-end. While the bike was down I had Art of War send the upper tubes out for Kashima coating and anodized the lower lugs. I feel like the coating color really works well with the blue.
Bummer man the engine blew out like that. Glad it didn’t take out the bottom end or cases.
On a positive note she is looking great with that new suspension!
Sorry to hear about the power valve arm failure. Did yamaha help by covering it?
Great seeing a local area build !
I didnt even try with the motor being mod its whole life. It wasnt that bad considering, more a bummer when it comes to time.
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