Product descriptionJets are just as much a must as variator rolls for every scooter pilot. With every tuning adjustment, irregardless how small, main jets (MJ) will have to be raised, secondary jets (SJ) are for idling adjustments.DELL`ORTO HD 6mm, Size 50-170 PHBL/PHVA/PHVB/VHS-MIKUNI VM16-20-GURTHNER PAA/PYA/PYM,in grades 50,52,55,58,60,…CAUTION: Please take notice that we use DELLORTO jets exclusively. It doesn’t make sense to save a few cents and use copy-cat jets. Those who’ve tuned carburetors and found the actual jet size does not correspond to the number engraved on the side, know what we’re talking about. If 105 is on it, then there’d better be 105 in it! Anything else is a cheap trick. OEM numbers (for comparisons):B06413.150 (MALOSSI)06413150 02 kommt nie (DELLORTO)