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i need some help with this? i've seen lot of 2000's for sale and they claim there "unrestricted" what does this mean? and why was it the only year they did this?
 

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Bikes are now restricted to a mere 186mph from the factory. Before that, they were free to run to top end until they ran out of power or were drag limited. But let's be serious: the ZX-12R won't top out much past 186mph, without a big bump in horsepower, a serious decrease in drag, and a very long run way. So, when you see that "unrestricted" BS, mostly pay no attention to it.
 

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this is all we are
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Stock 2000 12R had about 162.7 rwHP.

If it was drag-limited at 186 mph then everything else equal, to go:

190 mph requires 173.4 rwHP
195 mph requires 187.5 rwHP
200 mph requires 202.3 rwHP

Almost 40 more rwHP needed to hit the double-ton.

Even if it could hit 190 unrestricted, the 197 mph hype of the pre-production would have required an 11.5% increase in power from the production bike that was released -- 18.7 more rwHP.
 

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Maybe downhill without mirrors and a tail wind. Motorcycles are extremely aero dynamically inefficient, and it takes alot of juice to get a bike knocking on the door of 200mph, despite what the manufacturers might tell you.
 

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Jive Turkey
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Motorcycles are extremely aero dynamically inefficient, and it takes alot of juice to get a bike knocking on the door of 200mph, despite what the manufacturers might tell you.
I know that. I just thought I remember the big thing being "190+" when that bike was released.
 

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I know that. I just thought I remember the big thing being "190+" when that bike was released.
You are correct the very first year was the unrestricted chasing the busa as the fastest production bike ever. After that a few Euro countries go a bit anxious and bikes hence forth have been restricted to around 280-90 kph similar to high performance cars restricted to 250kph.
 

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You are correct the very first year was the unrestricted chasing the busa as the fastest production bike ever. After that a few Euro countries go a bit anxious and bikes hence forth have been restricted to around 280-90 kph similar to high performance cars restricted to 250kph.
they are restricted to 300kmph 186 mph

300 kmph is the number they all use now
 

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The last year before the EU threat of restriction, which resulted in voluntary restriction, was 1999. Beginning in 2000, the Busa and ZX-12R were electronically restricted to 300kph (= 186mph).

The Kawasaki was never a threat to the Busa as top-speed top-dog, in spite of the spewage of excuses from Brand K and their toadies in the motorcycle media. They claimed some electronic gremlin, but Cycle Canada did a no-shit wind tunnel test and found that the ZX-12R was no match for the Suzuki due to inferior aero.
 

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The Kawasaki was never a threat to the Busa as top-speed top-dog, in spite of the spewage of excuses from Brand K and their toadies in the motorcycle media. They claimed some electronic gremlin, but Cycle Canada did a no-shit wind tunnel test and found that the ZX-12R was no match for the Suzuki due to inferior aero.
Check out all the comparos, both bikes are within less than 2mph up top and the same number of "wins" in the category.
 
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