ProTaper's revolutionary Self-Engaged Launch Assist (SELA) solves a problem faced by all motocross racers, no matter their skill level: setting a start device alone is awkward at best and impossible at worst. With its patent-pending self-engaged twist dial, SELA can be easily set without any assistance, giving riders the freedom to practice starts and line up for races by themselves. During a start, SELA makes it possible to temporarily compress the motorcycle's front suspension, reducing its tendency to wheelie under acceleration. This optimizes rear wheel traction, allowing the rider to be more aggressive with the throttle and launch down the start straight with greater control. Its unique, modular design allows SELA to be installed on most full-size, late-model motocross bikes. A dual-hinged receiver ring makes for quick and convenient installation without removing the front wheel or fork. Patent-pending self-engaged twist dial enables easy, unassisted operation Dual-hinged receiver ring with variable clamping diameter for quick installation and precise fit Forged aluminum alloy construction optimizes weight savings, strength, and durability Hard-anodized moving parts maximize resistance to corrosion and wear Durable laser-etched graphics, including engagement confirmation markings Includes all parts and hardware necessary for a wide range of applications Detailed installation instructions and templates available under the Instructions & Templates tab Fits the Following Honda Year(s) Receiver Spacer Screw Set CRF250R 15–18 A 4.5 C CRF250R 19–20 A N/A A CRF450R 15–18 A 4.5 C CRF450R 19–20 A N/A A CRF450RWE 19–20 A N/A A Husqvarna Year(s) Receiver Spacer Screw Set TC 125 15–20 A KTM/HSQ B FC 250 15–20 A KTM/HSQ B TC 250 15–20 A KTM/HSQ B FC 350 15–20 A KTM/HSQ B FC 450 15–20 A KTM/HSQ B FC 450 Rockstar Edition 18–20 A KTM/HSQ B Kawasaki Year(s) Receiver Spacer Screw Set KX250 19–20 A 2.5 B KX250F 15–18 A 2.5 B KX450 19–20 A 2.5 B KX450F 15–18 A 2.5 B KTM Year(s) Receiver Spacer Screw Set 125 SX 15–20 A KTM/HSQ B 150 SX 15–20 A KTM/HSQ B 250 SX 15–20 A KTM/HSQ B 250 SX-F 15–20 A KTM/HSQ B 250 SX-F Factory Edition 15–17 A KTM/HSQ B 350 SX-F 15–20 A KTM/HSQ B 450 SX-F 15–20 A KTM/HSQ B 450 SX-F Factory Edition 14–20 A KTM/HSQ B Suzuki Year(s) Receiver Spacer Screw Set RM-Z250 13–20 B N/A C RM-Z450 13–20 B N/A C Yamaha Year(s) Receiver Spacer Screw Set YZ125 15–20 A 2.5 B YZ250 15–20 A 2.5 B YZ250F 10–20 A 2.5 B YZ450F 10–20 A 2.5 B