ALWAYS USE SEALANT ON JOINING SURFACES AND PRESSURE TEST BEFORE SETTING UP. UNI Reed Inlet Manifold, in partnership with AF Rayspeed. The Small Block UNI Reed will fit 125 / 150 / 175 inlet stud spacing. The Large Block UNI Reed will fit 200 cc inlet stud spacing. Easy fitment, in most cases, a straight forward replacement for the standard inlet manifold only requiring cutting the cylinder head cowl to fit. (some cylinders will need a small amount of fin cut off). Compatible with Standard and Performance carburetors. Using the aluminium flange they fit with an SH bodied carb (22/26mm Jetex) breathing through the air box. Using a flange inlet rubber they will also fit the PHBH bodied Dellorto (26/28/30mm) Carburettor. Compatible with any Minarelli Horizontal Reed Valve, ranging from cheap and cheerful to high performance. The Malossi VL14 performed very well in our testing. Why I might add a Reed Valve to my Engine. The Lambretta uses the piston to control the time the inlet port remains open. This means the inlet is open for the same number of degrees of crank rotation no matter the engine speed, throttle position or loading. That forces an inlet duration compromise that is built into the engine. Too long and the engine will spit back a lot of fuel at low rpm, and too short and the high rpm performance is stunted. Running a reed valve can allow the inlet to be controlled by pressure. This means that the engine can draw new mixture whenever the pressure in the crankcase is lower than atmosphere. The inlet is now controlled by demand, rather than a forced symmetrical timing. Improves fuel economy and lower rpm performance compared to a non reed inlet. With appropriate modifications the engine can also have a wider usable rev range and run a higher state of tune without losing the ease of use.
