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PERFORMANCE EXHAUST PACKAGES:
Off the showroom floor, the Yamaha WR250R/X is tuned more for fuel mileage and emissions, rather than performance. This makes the bike feel a little "corked up" or "anemic", but luckily there are a few things you can do about that.
To maximize performance and improve ride-ablity of your WR250R/X, we recommend that you...
replace the exhaust system (muffler AND possibly the stock header too) with a lightweight free-flowing exhaust
install an EFI (Electronic Fuel Injection) Controller to adjust the bikes fueling
remove the bikes EXUP motor/cables (very simple to do)
remove the bikes AIS - Air Induction System (very simple to do)
replace the stock air filter with a better flowing air filter
Doing these simple things will give the bike a nice bump in performance, making it much more fun to ride, plus it'll sound better, and you'll drop a little bit of weight at the same time (the stock exhaust is kind of heavy).
We've put together a few Performance Exhaust Packages that will give you everything you need to replace the bikes exhaust system, adjust fueling to take advantage of the new free-flowing exhaust, and remove the EXUP and AIS from the bike. All of the packages below will provide nearly identical performance gains, but each has different pros and cons. Read the descriptions below for more details...
OPTION 1: FMF Q4 Hex Performance Package (shown above)
We have this exact exhaust system on our Yamaha WR250R Project bike. It also happens to be our best selling performance package for the WR250R/X. It provides excellent performance gains, while being the quietest aftermarket exhaust available for these bikes. It is slightly louder (and has a much better sound) than the stock exhaust, but if you're looking for something on the quiet side, this is the one for you. It comes fitted with a USFS approved spark arrestor. This is our favorite exhaust system if you are off-roading your WR250R/X. Many customers do just the slip on muffler, and re-use the stock header, but you can also add an FMF PowerBomb or MegaBomb header if you so desire.
WR250R/X FMF Q4 Hex Performance Package
OPTION 2: Pro Circuit T-4 Performance Package (shown above)
We have this exact exhaust system on our Yamaha WR250X Project bike. This package provides excellent performance gains, beautiful fit and finish, and it happens to be the only exhaust on the market that allows you to re-mount the stock muffler and header pipe heat shields, which we think is a nice touch. From a sound standpoint, it is little bit on the loud side, and would be a bit louder than the FMF PowerCore 4 exhaust. It comes fitted with a removable USFS approved spark arrestor.
WR250R/X Pro Circuit T-4 Performance Package
The performance exhaust packages outlined above will take care of the exhaust side of the equation, but while you're at it, most riders will also replace their bikes stock air filter with something that flows air better.
On our WR250R and WR250X Project Bikes, we use the No Toil Super Flo Filter Kit, which was developed by No Toil to increase performance and improve throttle response. These kits are a complete replacement for the OEM WR250R/X Filter and Cage assembly. Included in the kit is a super-strong, high density polymer filter cage with no backfire screen that will allow you the maximum amount of air to flow freely to the intake. You also get a top quality, two-stage, flame retardant, pre-oiled foam air filter. The foam is specially treated to extinguish flames and sparks, so this filter won't burn.
WR250R/X No Toil Super Flo Filter Kit
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