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1
Description
The BETA VALVE SPRING (OEM 027.11.034.00.00) is the original Beta valve for the RR 350 4T, RR 350 4T RACING, RR 350 4T X-PRO, RR 390 4T, RR 390 4T RACING, RR 390 4T X-PRO and 6 more models (2017–2026). It controls intake and exhaust flow wi...