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• Countershaft made from aircraft alloy steel
The MICHELIN Silica Technology provides enhanced wet grip in comparison with the MICHELIN COMMANDER II tyre
Champion in the Trial category
* Designed for Harley-Davidson heads* Use with OEM style valve seals
AV&V AV-VSK590 Valve Spring Kit for Big Twin 48-84 w/0.590" Lift • Countershaft made from aircraftNote: Maximum Recommended Lift = . 590in.* High Performance Spring Kit * Silicon & Vanadium alloy spring wire * Increased travel before coil bind * Complete Kit includes: springs, retainers, keepers & lower collars Tech Tips: * Rocker box clearance must be checked * Spring travel must be checked * Valve timing must be accurate ** Over revving will lead to pre mature failure of Valve Springs & collars.