Hi, first time poster here. I recently bought a 1999 yz400f and have been going through the carb as a maintenance thing. I had been distracted from the project, and finally got time to pick it back up today. I was checking the torque of the main jet and ended up shearing the threads off. The threads of the main jet are now stuck in the needle jet. My question is how do i approach fixing it. The jetting is completely stock, as is the engine other than an add-on stator that acts like a flywheel weight. 1) Do I replace with all stock parts, or do I take the opportunity to rejet? The few miles I was able to ride it before tearing it down didn't show any problem with the stock jetting. Is there a recommended change to go to from the stock jetting (I believe 180 for the main)? I am running the stock exhaust and plan on getting an exhaust with a spark arrestor or running a PMB end cap. 2) It appears that the needle jet is not one that is replaced when rejetting. It also appears to be extremely expensive. If I can extract the broken threads of the main jet out of the needle jet, do I only need to replace the main as part of the rejetting? Or does the needle jet get replaced while tuning? Thanks!