On this week’s Two-Stroke Tuesday we give you an exclusive first look at our 2019 Yamaha YZ250 project build for Mike Brown. We have products from Dubya USA and Seal Savers featured in the 2-Stroke Hardware section and 2-Stroke theater is packed full of premix burning machines for your viewing pleasure. If you are a fan of Yamaha Two-Strokes don’t miss the exclusive link to our Prodigy 2.0 build with Moto Whips at the bottom of this post.
This machine was built for Mike Brown to race the Wiseco Two-Stroke World Championships at Glen Helen Raceway. We made targeted changes internally using companies like Boyesen and Rekluse. Externally we went a little wild with products from Dubya, FMF, Red Label, SDG, Pro Taper, Specbolt and Acerbis .
Wheels always take a beating and the crew at Dubya made sure our YZ250 had top of the line components. The stock units where replaced with Talon carbon fiber hubs, stainless steel spokes, aluminum nipples and black Excel A-60 rims.
The IMS Products Core pegs offer a stable platform for your feet and have two different levels of teeth sharpness depending on rider preference .
The engine wasn’t drastically changed internally. We did instal a Rekluse Core Manual TorqDrive clutch and CNC machined billet aluminum clutch cover. The TorqDrive system is designed to provide the ability to fine tune the transfer of power to the ground. Rekluse does this by using more disks in the same amount of space so up to four additional frictions disks are allowed to be used compared to the OEM unit. More friction plates mean more torque capacity translating into more power transfer directly to the rear wheel. To further fine tune power delivery Rekluse offers a variety of different spring options that can be combined for a completely custom feel depending on the riders preferences.
One internal modification we did was instal a Boyesen Supercooler. This item replaces the OEM water pump impeller with a larger one and a housing designed to flow fluids more efficiently to keep the engine running cooler.
The OEM reed cage was replaced with a complete RAD Valve system from Boyesen that utilizes multi-stage reed timing and aerodynamic surface optimization to improve performance. We also installed a complete FMF Factory Fatty pipe and their brand new Titanium Powercore 2.1 silencer designed to improve performance throughout the power curve .
The chassis received ample amounts of attention in the way of aftermarket bolt-on items. Almost all the OEM nuts and bolts were replaced with Nickel Würks units from Specbolt adding some bling factor and increased strength. Stock aluminum washers were also replaced with drilled and anodized units from Specbolt as well. The last major chassis upgrade to the chassis was done by Enzo Racing. Enzo Racing has been intertwined with factory KYB for years on the racing and development side and Brownie worked with them back in his Yamaha Of Troy days so it was an easy fit.
DUBYA USA WHEEL SETS
Add some bling and strength to your ride with Talon carbon fiber hubs, stainless steel spokes and Excel A60 rims. The crew at Dubya USA can make it all happen!
Peg Savers are a brand new product from Seal Savers that are designed to help keep rocks, mud and debris from getting into your foot peg hinge, allowing your pegs to stay in a horizontal position. Made out of the same material as Seal Savers and designed for easy instalation, simply slide the Peg Saver over your peg. Available in a variety of colors and come four to a pack.
If you like the Yamaha YZ250 featured on this week’s Two-Stroke-Tuesday check out the full story on our Moto Whips YZ250 project. Click the image below for more!