Reed valve packing plate - Spacer -SEVEN 7 RB- Lambretta - 3mm

Diaphragm packing plate to place the diaphragm 3 mm high on the RB cylinders. This releases the boost port.
Can only be used in conjunction with the Seven 7 RB diaphragm intake manifolds, as the RB diaphragm is recessed in the intake.
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