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Discussion Starter · #1 ·
The flatslide carb I put on pulls the bike hard but also the vacuum line closed and shuts the gas off . I bought a pepcoc online that advertised to fit a 2003 Kfx 400 but the delivery side was smaller diameter and I now it doesn’t work help please this carburetor is the best I found yet. Ty to anyone who helps me!
 

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You want the petcock from the Raptor 660. Make sure you get the OEM one from Yamaha not an aftermarket one as you will run into the same issue of the supply side being to small. You can also run your factory LTZ/KFX petcock in the prime position as that does not require the vacuum signal.
 
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