Drilling the PowerNow

There is an updated power now. The original PowerNow slices the single air venturi going into the carburetor into 2 smaller, faster, venturis. The update assists the vacuum of the fast moving air by drawing the fastest moving air molecules through a precisely positioned hole in the plate, drastically increasing the speed of the top and bottom venturis entering the cylinder. With this new modified plate, the result is volumetric engine efficiency through uncompromised airflow velocity. They showed a dynos from a YZ450F and CRF450 that indicate doubled the gains from the original power now over stock. See Carburetor Upgrades: PowerNow.

This is a simple modification that can be easily performed on the older PowerNows.

 Procedure

1. Remove PowerNow
2. Find center of plate and measure 0.6" from the edge of the plate that faces the slide. Mark with punch or scratch awl (Figure 1).
3. Drill small pilot hole (Figure 2)
4. Successively enlarge hole a little at a time with larger drill bits until reaching the necessary size of 0.25" (Figure 3)
5. Clean ruff edges and burr with small round file and emery paper (Figure 4).
6. Install PowerNow.

For testimonials see the TT links below. For dynos and other information see www.dspmoto.com.

Figure 1

Figure 2

Figure 3

Figure 4

Click images to enlarge

 TT Archives (Updated by TT member chrissa 01/03/05)

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