Re: Tire Changing questions

[Jack Bunce <jackbunce@xxxxxxx>]

On Thu, 24 Jun 2004 00:35:54 EDT, Tpcutter@xxxxxxx wrote:

> SNIP
> The bounce is at least partly due to the  two universal joints in the
> paralever driveshaft. With the bike on the  centerstand, there is a 
> lot of angularity
> in the driveshaft, almost ten degrees.  The u-joints have to 
> accellerate and
> decellerate twice per revolution. The  closer the shaft is to parralel 
> to the
> transmission output shaft, the less  angularity and less accel/decel 
> effect.
> When on the road with your weight on the  bike, and the weight of the 
> bike on
> the spring, the shaft is pretty close to  straight. If you ever "jump" 
> the bike
> so the rear wheel goes airborne, you'll  feel the same rumble from the 
> rear
> as the swingarm reaches the end of its'  travel.
> SNIP

Thanks, Tom.

  I had only considered the possibility of defective universal joints 
without considering the actual geometry and the forces involved 
although I do know better, having researched universal joint geometry 
on the web before. (Actually a fascinating subject even with the 
diversity of opinion of joint phasing!)

Never tried to jump my R1100S, and I hope I never do!

I do notice a rumble or perhaps a light hammering lately at higher 
speeds, e.g., over 65 or so.  It seems to me that before it only 
occurred in 5th gear and now 6th also. Could just be me being overly 
sensitive due to my concerns about the comment from the dyno operator 
and the quality of the work done by the out of state dealer who both 
put the Z6s on and did the 12K checkup. Mileage now is about 21,500 or 
so.

Gonna rebalance for sure before the trip to Spokane.

cheers.... jack, '04 R1100SA, Waterford, Connecticut, U.S.A.

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