Dellorto main Jets for PBGH Dellorto Carbs which take 5mm main jets.
Please make sure you know what size jet whether the are 5mm or 6mm your carbs needs. The 19-21mm take these 5mm jets. Need help call 301 351 7330
Your main jet should be increased when adding upgrades to your scooter. Adding exhaust, air filters will need more fuel to run correctly and not be leaned by more sir flow.
These jets will also fit the off brand carbs from Motoforce, Naraku and others that copy the Dellorto carbs.