WR250F Exhaust Baffle

The stock exhaust on the US spec WRF comes with a baffle in the tip of the silencer (Figure 1). This restricts the exhaust to exit through a pencil sized opening. This robs a lot of power from the bike. To remove the baffle, take out the 10 mm bolt holding it in place and slide it out (Figures 2 and 3). Removing it provides a 48mm-sized opening (Figure 4). The bike runs much better without the baffle, but is also much louder. For aftermarket inserts that are available to replace the stock baffle see "Not Free" Upgrades: Exhaust. Most of the non-US WRF’s come with the baffle welded in place in which case an aftermarket or YZF stock exhaust is the only solution.

Figure 1

Figure 2

Figure 3

Figure 4

Click on images to enlarge

 Update for 2003/2004 Models

The exhaust baffle modification is unchanged for the 2003 model.

 Update for 2005 Model

TT member Qball

The endcap has been changed on the 2005 model (Figure 1) to the FIM legal "non-stinger" type. Removing the baffle is slightly more complicated than on previous models.

1. Remove end-cap
2. Drill out the rivets that hold the baffle in place
3. Remove baffle
4. Reassemble end-cap

click on images to enlarge

 TT Archives (updated 09/04/03)

	ThumperTalk $3 Spark Arrestor
	ThumperTalk Baffle
	ThumperTalk modifying the WR stock exhaust insert
	ThumperTalk Stock pipe mod question
	ThumperTalk WR 250 muffler insert

Listed here are what I consider the most helpful threads. There are more threads on this topic in the ThumperTalk archives. To find them, search the YZ250F/WR250F forum. Suggested keywords: exhaust baffle, baffle, exhaust plug, exhaust insert, muffler insert.

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