To get the most out of your FCR carb-equipped quad, the airscrew must be adjusted to account for altitude and air density, as well as aftermarket exhaust. Many FCR carbs supplied on green-sticker-ready ATVs such as the ‘06-’08 TRX450R come with a nonadjustable airscrew (there’s no slot for a screwdriver or wrench). This was done to pass emissions laws and be eligible for the green sticker. With the float bowl removed, you can unscrew the airscrew with pliers and cut a screwdriver slot into its head with a small Dremel blade or a really small hacksaw blade. Once reinstalled, you’ll have an adjustable airscrew.

Tags: airscrew, FCR, TRX450R

This entry was posted on Thursday, February 28th, 2008 at 12:00 am and is filed under How-To, How-To, Maintenance. You can leave a response, or trackback from your own site.