Just another product offered by TSO that makes my bike build better. Looks great and will survive the Southern Arizona desert.
Two-Strokes Only Handcrafted 2022–2027 Yamaha YZ125 YZ125X Cone Pipe- MX
Sale price
$540.00
Shipping calculated at checkout
Mass-produced stamped expansion chambers are built around press tooling and cost targets—not maximum acoustic wave tuning. Every Two-Strokes Only cone pipe is fabricated from scratch in-house using individual rolled segments to deliver sharper throttle response, stronger midrange pull, and crisp over-rev for the 2022+ generation Yamaha YZ125.
Construction & Fabrication
- Cold-Rolled Mild Steel: Selected for optimal acoustic resonance and wall durability without unnecessary weight penalty.
- Oxy-Acetylene Welded Seams: Every cone joint is gas-welded by hand—never MIG or TIG tacked—creating a soft, ductile weld zone that resists work-hardening and stress cracking under high-RPM 125cc vibration.
- Hand-Planished Seams: Each weld bead is planished smooth to eliminate internal steps and turbulence along the boundary layer, maintaining uninterrupted pressure-wave reflection from the header to the stinger.
- Direct Chassis Fitment: Jig-built specifically for the revised 2022–2027 YZ125 cylinder exhaust flange, frame cradle, and radiator clearances, utilizing OEM mounting points and springs. Compatible with both the factory Yamaha silencer and aftermarket slip-ons.
Specifications
- Material: 1.0mm (19-gauge) Cold-Rolled Mild Steel
- Weld Process: Hand Oxy-Acetylene Welded & Planished Seams
- Finish: Raw Uncoated "Works" Steel
- Application: Motocross / Closed-Course Competition
Fitment
- 2022–2027 Yamaha YZ125 (including Monster Energy Yamaha Racing Edition)
- 2023–2027 Yamaha YZ125X
Finish & Care Note
This expansion chamber ships in a raw, uncoated works finish. To prevent surface oxidation, wipe the exterior down with a light coat of motor oil or two-stroke oil after washing and riding.
Compatibility
Fetching compatibility details...
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Customer Reviews
Overall rating: 4.9 / 5 from 67 reviews.
Part seems to be machined well.
Perfect solution for replacement of OEM. Allows for smoother and more positive engagement.
Shipping was fast, the product is great! When you could still buy the shift forks from Kawasaki they came out of spec :-( These are in spec and far better quality than Kawi's forks. They are in the bike and vastly improved the shifting on this KX500 BEAST!!! Thanks Luke!
Unfortunately, the gas cap got scratched during shipping, but after a few friendly emails, the problem was resolved perfectly for both sides. Friendly service, quick solutions, absolutely reliable Top-notch shop👍
Perfect product... Perfect all around transaction!!
Great solution for KX500 airbox seal issue. Very nice product.
1989-2004 Kawasaki KX500 Billet Air Filter Sealing Kit (1989-2004)
Everything I have received from TSO has been excellent, I was excited to see TSO had the pressure plate because they was the only ones , thanks for amazing products and service
1988-2004 Kawasaki KX500 88-91 KX250 KDX250 Clutch Pressure Plate 13187-1060
Amazing!!! Luke is so helpful. These cases are amazing and a direct fit of my old cases. All parts are equally made and not one is below my standards
Very well made pipe fits good have not been riding yet so don’t know if it leaks out two stroke oil like the stock one does we will see when it gets cool out for riding
My first order and I'm very happy!
Killer cover!!! Great fitment
Fitted without issue and looks the part, just need to upgrade other parts to look as nice.
Great communication they help me out when I question about how curtain things go I highly recommend them
Loved the part. Disappointed that I paid extra for 2-day shipping but it was shipped ground, though.
It fits perfectly, and its even better than ever.
1989-2004 Kawasaki KX500 Center Power Valve assembly| 12023-1058 & 12005-1111
Awesome custom part! Finally someone makes good parts for my 89 Suzuki lt250r. Great customer service.
Exelent product
Everything looks great ! Quick turn around very pleased ✌️
Great billet part for my KX500. The machining quality is amazing. Much better than the stick plastic part.
1989-2004 Kawasaki KX500 Billet Air Filter Sealing Kit (1989-2004)
Great product
Part works great!
The best machined pieces I have ever seen. I have wanted a two piece KX500 billet side cover for a long time and can't wait to install it. So trick!
Very quick shipping, and super pleased with the quality of this stator cover! The anodized black blends nicely with the satin black powder coat on my KX500 engine.
Two strokes only is the place to get hard to find KX500 engine parts. The best machined parts I have ever seen.
1989-2004 Kawasaki KX500 Center Power Valve assembly| 12023-1058 & 12005-1111
Great quality, exceptional service
Fine quality piece too bad it's hidden away from the eyes 😎
👍
head look great and quality is superb
Quality parts!!! Very happy with what I received for the money!! Fit and finish is top tier. Also happy to support a company who is helping keep these two strokes alive! I will be back for more parts soon!
Bearings were a perfect fit. A couple of shaft bearings were on back order, which I reicieved shortly after a majority of my orders arrived. Quality of everything is immaculate I would certainly do business with Luke again. I honestly wish I could have purchased the billet cases for my kx500af build after seeing the precision on the covers and head. Highly recommend TSO
great shipping
Very thankful people out there make this stuff!!
Haven't installed these parts yet but the maching and quality looks better than OEM. Looking forward on trying out their other specialized parts offered.
Quality piece, may buy another. Can't wait for LT500 heads to become available. Will buy 2 when that day comes.
Finally a great after market head for the lt 250! Fits, looks and runs great!
My suspension guy loved the shock, which is high praise. He has seen a lot of custom suspension components in his career.
👍
KX500 Engine Rebuild Bolt Kit for Kawasaki KX 500 Specbolt Nickel Wurks Ti Look
Quality piece. I should have bought 2.
Great outlet, must have if using the billet clutch side cover on a steel frame bike!
