Jetex 22mm carb, supplied already jetted up for use with Casa 185cc kit. The manifold for this carb, to use with the Casa 185cc kit, is available from us : item No. B254 Please note that with all 'ready-jetted' carbs, there CAN be differences in final settings based on weather, altitude and atmospheric conditions of the customers location so it is understandable that some fine tuning will be required. This is supplied with the jetting we have found to be most common for use with the Casa 185 kits used in conjunction with a Gori 50mm exhaust, Casatronic ignition set at 26 degrees (retarding to 18), GP200 airhose and std. Series 3 airfilter box with the internal baffle still in place. If you have a different set-up to this, then the settings will need to be adjusted to suit.