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The Polini Big Evolution reed valve is a large valve reed block with a larger intake area. It is a two-piece design with a CNC-machined and anodized mounting plate. Comes with 0.3 mm thick carbon reed valves. To use this reed valve, you will need to open the engine block to a width of 39.5 mm. Optimized for 24 mm to 28 mm carburetors. Please note: Due to the increased diameter, the engine case will need to be reworked to accommodate this part.
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, anodized 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. Optimized for 24mm to 28mm carburettors. Warning: due to the increased diameter, the crankcase will need re-working to fit this part.
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