I had a good look on the way home from work and mine's doing 3800rpm at 100kph. It pulls smoothly and hard enough for general overtaking still in sixth but for more fun or a smaller gap I knock it down a couple.
I don't believe that cruising along at low revs does any harm, and I'd say it'd just waste fuel cruising at 100kph in a lower gear.
However I'm a strong believer it giving it a regular handfull to blow out the cobwebs!

 

As I recall, Luis' bike is a mark 1 with speedo drive off the front wheel.?(Hola compadre !)
The only way you could get the speeds/revs quoted would be to increase the front sprocket size to 18 or 19 teeth, and a 42 rear.
Maybe the speedo or revcounter's just off spec.......

 

Daniel_ARG's (Luis?) signiture says he has a 92, and my Haynes manual says all bikes after 89 had speedo drives driven off the countershaft.

 

Nope, I'm not Luis and I correct myself, turns out I have a 17/42 combo, this was my mistake:



Thought that number meant the tooths on the sprocket, but no, is this one:



Counted them and yeah, 42 is correct. Did the same with the front sprocket, 17 tooth.

Tested it this weekend with a digital speedo (measures up to 299km/h), wich is pretty much the same as a GPS in accuracy, using the tire outer diameter (at 36 psi) to calculate speed.

These are the results:

- Below 100 km/h (63 mph) both speedos show the same speed.
- Above 100 km/h (63 mph) the digital shows 5 km/h (3 mph) less than the analog.
- My guess is that the error increases above 200 km/h (125 mph) to about 7 mph or so.
- Tested tachometer in low gear, goes to 10.000 RPM with full throttle easily, so no error there.
- At 5000 RPM in 6th gear:
Analog speedo shows 160 km/h (100 mph)
Digital speedo shows 155 km/h (97 mph)
- Tested with my Kawasaki riding along with a friend of mine, both speedos showed the same speed at 120 km/h (75 mph) where the CBR shows 3600 RPM, and the GPZ 5500 RPM

I know measurements aren't 100% accurate, but I'm surprised that my bike is the only one doing 100mph at 5000 RPM, without any mods.

 

I'll be doing some more testing in the next couple of days, since the tach might be wrong. I'm getting a digital tachometer then I will know if the problem is there.

I have scheduled a track day for april and it's not a good idea to go there with the tach showing the wrong RPM's.

 

Gawd, I hate getting old............
Sorry Daniel.

 

hehe no prob Pete, I was actually just making it clearer for the rest.
Btw, sent you a couple of PM's not long ago, I think they must have got deleted when the forum changed?

 

Didn't receive them - must have been a ghost in the program !

 

4500 RPMs @ ~120 kph (75 mph)