Extended Fuel Screw Hawk 250 and Jetting

[kwarb]

Wanted to let everyone know that the 2021 Hawk 250 stock carburetor uses a Keihin CV/CVK fuel screw. I have a 2006 Kawasaki KLX 250s and 2017 Kawasaki KLR650 which both have the stock Keihin CVK34 and CVK40 carburetors. The fuel screw in those bikes and the Hawk 250 is basically the same. What that means is that you can buy an extended fuel screw for a Keihin CVK carburetor from Amazon for $10 and it will work with the Hawk 250. I will try to post 3 pics, never done it before so not sure what happens. If it works, one is of the Hawk fuel screw beside one from a KLX, one is of the Hawk screw beside an extended screw, and one is of the extended fuel screw on the Hawk.

Also, I got my bike a month ago. I know how to jet a carburetor well enough so no real issues for me, but let me share my experience with those who have never done it or at least never done this bike. I opened my carb before ever starting the bike to know what was in it. It came stock with a 40 pilot, 105 main, fuel screw at 1.5 turns out. No need to adjust anything so just closed it back up. Bike was not hard to start with the choke, but really really hard to keep it running until it was warm - it would totally die with the throttle at 1/16-1/8, but great if over 1/8th. When it was warm it was fine, except (1) it would die immediately if you lightly bumped the throttle for 1/4 second off idle and let off - though it would rev out fine if you held on and did not let off, and (2) it was burning plug tips white. Obviously way lean somewhere, but no issue revving it out. Since pilot jets cannot cannot really burn a plug, to me clearly a needle issue - FYI I ride trails mostly in the 1/4 throttle or less range. I put two 3mm washers under the non adjustable needle and the bike starts really easy, never dies, jumps off idle with a throttle twist, and it purrs like a kitten at 960 rpm idle. All bikes are a little different, but for new owners, I would shim the needle first before breaking the tamper seals on the carb. You only have to unscrew the throttle cable and pull the slide to shim the needle, but you may have to remove carburetor to get out the slide.

Hope I can help someone!