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The Big Evolution reed valve from Polini is a...
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The Big Evolution reed valve from Polini is a big valve reed block with larger intake area. It's a two-piece design with CNC-machined, anodised fixing plate. Comes with 0.3mm thick carbon reeds. In order to use this valve, you will have to open the engine block to a width of 39.5mm. Optimised for 24mm to 28mm carburettors. Attention: due to the increased diameter, the crankcase will need re-working to fit this part!
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