Lower Engine revs

[twowheelnut]

The math ain't working for me... anyone care to click a piccie at speed?

 

[jestal]

So what changed?? The final drive ratio or the bevel gear set ratio or the trans ratios?

In any case it certainly seems to be directionally correct as I am always trying to shift into "6" on my 03.....LOL.

As far as the smoother shifting comments on the 06 it is also possible that Yamaha opened up or closed up the windows and/or widened or thinned the dogs on the gears and even changed the ramp angles on the dogs to make the transmission work smoother. Quite possible. Maybe to do with the development on the automatic shift set up they fine tuned the relationship of the shift elements to make the trans shift smoother along with the automatic operation. Once the automatic operation software and control logic was developed you now have a very stable, repeatable shift event (something the rider could never do manually) so it would be easier to fine tune the shift elements in the trans using a design-of-experiments approach.

There may be more refinement to the o6's than met the eyes originally...so to speak. LOL

 

[flyinlow]

OK, maybe this will end the argument. This is right off the Yamaha web site for features for the 06.

Taller overall secondary gearing reduces engine rpm for more comfortable long-distance touring.

 

[sparky3008]

OK, maybe this will end the argument. This is right off the Yamaha web site for features for the 06.
Taller overall secondary gearing reduces engine rpm for more comfortable long-distance touring.

I know of no argument just a discrepency between numbers of two people with the same year bike and two different numbers and a question of which one is correct.

I believe that between 05 and 06 there is a difference just wondering how much???

 

[Constant Mesh]

The calculated values I provided earlier in this thread are accurate. If you compare the transmission data from the '05 & '06 Owner's Manuals the only change is the number of teeth on the output gear of the transmission. This gear has 36 teeth on the '05 and 37 teeth on the '06.

'06 Secondary Reduction Ratio = 2.698

'05 = 2.773

2.698 / 2.773 = 0.973

'06 Engine RPM = '05 RPM x 0.973 for a given road speed.

With the more compressed scale of the '06 speedometer it's probably more difficult to get an accurate MPH reading from this instrument.