Dell'Orto Main Jet carburetor 5mm

You should always start off with a too-large main jet when going about jetting your carburetor; then decrease jet size in steps of 5 until your engine is running fine. Run your scooter with open throttle for a short time and then cut the engine dead, remove the spark plug and take a look at it. If it is black or/and overly oily, the mixture is too rich and you'll have to decrease jet size. If it is whitish, the mixture is too lean, which can lead to engine seizure! A proper mixture is indicated by a medium brownish/reddish spark plug.

Sizes: 50 / 52 / 53 / 54 / 55 / 60 / 62 /65 / 68 / 70 / 72 / 75 / 78 / 80 /82 / 85 / 88 / 90 / 92 / 95 / 98 / 100 / 102 / 105 / 110 / 112 / 115 / 118 / 120.