Vortex CK4243 GFRA Conversion Chain and Sprocket Kit - 520 16/41

The Vortex CK4243 is a GFRA (Go Fast) 520 Conversion Chain and Sprocket Kit designed to deliver faster acceleration through a lower gear ratio compared to stock. This ready-to-install kit requires no chain cutting and includes a precision-matched front sprocket, hardcoat aluminum rear sprocket, and a Japan-made Vortex SV3 series chain — all pre-sized for a direct bolt-on fit.

The kit runs a 16-tooth front sprocket paired with a 41-tooth rear sprocket, dropping one tooth on the countershaft sprocket from the OEM 17/41 gearing. This shorter gear ratio sharpens throttle response and improves acceleration out of corners without changing the rear sprocket tooth count.

Kit Gearing:

• OE Gearing: 17 front / 41 rear
• Vortex Kit Gearing: 16 front / 41 rear
• Chain: 520RV3 — 110 links

Rear Sprocket — F5 Hardcoat Aluminum:

• Constructed from 7075-T6 aerospace-grade aluminum for an optimal balance of strength and reduced rotating mass
• Hard anodized with a jet black dye, then coated with PTFE for added lubricity — the F5 process produces an ultra-tough, long-lasting surface that resists wear and stays cleaner longer
• Significantly lighter than the OEM steel sprocket, reducing rotational mass for improved acceleration

Chain — Vortex SV3 Series (520RV3):

• Manufactured in Japan to the highest quality standards in the industry
• Features a dual pocket sealing system for superior lubrication retention
• Delivers up to 7 times longer wear life compared to standard O-ring chains
• Pre-cut to the correct length — no chain cutting or modification required
• Includes a rivet-type master link

Kit Contents:

• 1x Vortex induction-hardened steel front sprocket (16T)
• 1x Vortex F5 hardcoat aluminum rear sprocket (41T)
• 1x Vortex 520RV3 chain — 110 links with master link

The 520 conversion reduces chain and sprocket weight versus a standard 525 or 530 OEM setup, freeing up additional horsepower and reducing gyroscopic forces. Note: Always compare OE gearing to kit gearing to verify the gear ratio change meets your riding goals before installation.