powerhouseatv. 16 posts · Joined 2005. #2 · May 10, 2005. Stock 05 YFZ450 settings are: 158 Main Jet. 42 Pilot Jet. YFZ needle on the 3rd clip. Czchr1s. 3 posts · Joined 2021. See diagrams above for main jet locations. The pilot / idle circuit is the next step when tuning. The pilot circuit is metered by either a removable jet or fixed bush, adjusted by a pilot screw. Amal Monobloc carbs, the very early MK1 Concentrics (1967-68) and MK2 carbs all have removable pilot jets. Sometime in 1968, Amal deleted the pilot jet The pilot jet is stock 42.5. The pilot needle is a dynajet needle and if my memory serves me correct the clip is at either the middle slot or the second from the bottom, from the pointy end of the needle. The slide has been drilled, so there are two holes beside the needle. I did not pull the main jet to see what it is since it runs great on PT. INDOMOBIL NIAGA INTERNATIONAL 2W SERVICE TRAINING ADVANCE KARBURATOR Bypass Bypass Pilot outlet Pilot outlet Pilot jet Pilot jet ( 1 ) ( 2 ) 14 PILOT SYSTEM 2. TIPE LUBANG GANDA. PT. INDOMOBIL NIAGA INTERNATIONAL 2W SERVICE TRAINING ADVANCE KARBURATOR Jet needle Main air jet Needle jet Main jet 15 MAIN SYSTEM. PT. Vay Tiền Trả Góp Theo Tháng Chỉ Cần Cmnd.

setting pilot jet dan main jet