Dellorto carburettor tuning PHBG 21mm Type DS with oil connection (without vacuum connection) for separate lubrication. This carburettor can be operated with the normal oil pump and pre-mix fuel must not be used. The 21mm covers all imaginable tuning cylinders and high-end cylinders. Top quality from Dellorto that`s easy to tune. For the air filter connector on 38mm a black adapter is included. Connection engine: 25mm connection Air filter side: 32mm (without adapter) 38mm (with adapter) Choke Jet: M5 # 60 Jet: 262AU main jet: M5 # 092 Pilot jet: M5 # 050 floats: 9450.1 / 4.0g carburettor slide: 40 (metal version) needle choice: W7 Choke type: lever pull type.