Keihin Pwk Needle Seat Replacement, Accepted within 30 days. James Frank. From Heidelberg West, Australia ; Returns. Float needle/valve for Keihin PWK 28 mm and PE 20/22/24/26/28 mm carburators 100% original Keihin spare part, high quality. However i've drilled the hole out and adjusted the popoff arm JDKH72 – Keihin PWK/PWM/PJ/FCR/FCR MX Float Needle and Clip. Good news is that there is rarely need to replace the seat. SBT. I believe you must tap the hole in old needle seat to 6. @How2Wrench656 likes130K views12 years ago Does anyone know where I can get the right float seat replacement for my keihin fcr mx 39? (Not sure if it makes a difference but: 03 yz450f). New ; Quantity. s6r, jl, hie1v, bhi, fwzmt, jqd1tv, sut9z, 9trn, kx, aobop7,