My recently acquired ER6n 2008 had a really sloppy throttle action when I bought it. I discovered it when riding 120 miles home. Close inspection revealed the both throttle cables outer sheaths had cracked apart completely! Replacement was urgent and essential. I checked out the prices and when I'd recovered I turned to eBay. A quick search found a pair of used cables for £12.99 including shipping. Two days later they arrived and 30 minutes of the following morning had them fitted and adjusted. The throttle is now really responsive to closing which had been the main problem and it makes the bike feel much better. The hardest part of the job was refitting the two screws in the plastic surround on the handlebar. Overall an easy fix for anyone to do!