Here is the Ø17.5mm carburetor from TNT, model PHVA. This carb has a separate greasing and vacuum outlet. This PHVA carburetor will be able to be mounted on your 103 / MBK 51 mopeds, mécaboites and scooter, it is up to you to adapt it properly (pipe, sleeve, fittings, ...).
Its diameter for air filter is 37mm (external measurement). This carburetor is certainly not DELLORTO quality but it is very affordable! Its finish is smooth and clean. Some reproaches despite everything ... non-certified parts (jets, needle ...). Otherwise, we recommend it for those who use their 2 wheels every day.
It has a multitude of adjustments: richness screw, idle jet, needle valve,… An excellent compromise between performance / aesthetics / low price! It is also important to know that all DELLORTO parts are mounted on this carburetor. Delivered as presented, complete.
Delivered with jets in 55, 60, 65 (mounted on the carburetor), 70, 75, 80 and 85 + a straight cable inlet and a cubit!
In addition to this, you need to know more about it.
Summary :
Starter: lever
Possibility of vacuum valve: yes, delivered with shutter.
Separate lubrication: yes
Flexible mounting for sleeve or pipe Ø24mm anti-slip lip
Air filter fixing: unthreaded Ø37mm