Fasstek stiffer valve springs to reduce valve float and prevent engine damage at high RPMs. Strongly recommended to install together with a performance camshaft or a higher rev limiter.
Recommended sizes:
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2.9 mm / 39L → for engines up to 200 cc with a camshaft providing a maximum valve lift of 8 mm
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3.0 mm / 47L → for 200 cc and larger engines with a camshaft providing 8 mm–9.5 mm valve lift
