FrogZ wrote:I didnt think 12's WERE restricted....
definitely - the earlier ones (2000-2002?) did not have a limiter in the ignition system - they could freely rev out to a *supposed* top speed of about 320 ? Fastest speed obtained by AMCN in 2001 at an airstrip in Vic was 304 measured by radar, so that would be an accurate measurement - and also account for the speedo error at top end.
From the 2003 or 2004 model, they had a restrictor built into the ignition system, which cuts the spark at a pre-determined point when the CPU recognises both 6th gear and 11,000 rpm on the tacho. This is meant to be a limit of 299kmh, same as current ZX14 and Busa's from about 2002 ?
It can be easily by-passed with a timing retard eliminator (TRE), which just fools the CPU into thinking that the bike is in 5th gear not top, and allows full ignition in top gear.
Any bike showing 300kmh on the speedo *will not* be doing 300kmh, its that simple. Most speedos have an error factor of anywhere between 2 and 10% - less error at lower speeds. Faster you go, higher the error factor becomes.
300 on the dial will anywhere between 270 and 285-290.
The only way to get an indicator of true top-speed is to be measured by an accurate radar, down an airstrip.
