Nice restoration and the driveshaft grenades!

[oilhead110]

Made a run up to 90 MPH then let off the gas and it sounded like someone banging a hammer under the bike. It made some nice grooves in the rear bevel gear housing.

Dale

http://i109.photobucket.com/albums/n72/oilhead110/IMG_6032.jpg?t=1232300558

http://i109.photobucket.com/albums/n72/oilhead110/IMG_6031.jpg?t=1232300604

http://i109.photobucket.com/albums/n72/oilhead110/IMG_6027.jpg?t=1232300667

[PGlaves]

Mileage on the bike???

[sgborgstrom]

http://i109.photobucket.com/albums/n72/oilhead110/IMG_6032.jpg?t=1232300558

I can't remember ever hearing of a failure like this. Wow.

Interesting that the photobucket links won't appear as images....

[oilhead110]

Mileage on the bike???



53K on 1991 K100RS original owner. Bike has never been abused.

Dale

[PGlaves]

53K on 1991 K100RS original owner. Bike has never been abused.

Dale

Wow! I generally consider those U joints to last 125K miles - a rare failure as early as 100K, and many last over 150K. Voni's R1100RS broke one at 182K miles.

I'd be fairly certain that they were not phased correctly at some point in their young lives.

[byker]

Paul,

What does "phased" mean.

[oilhead110]

Wow! I generally consider those U joints to last 125K miles - a rare failure as early as 100K, and many last over 150K. Voni's R1100RS broke one at 182K miles.

I'd be fairly certain that they were not phased correctly at some point in their young lives.

It wasn't phased, it appeard the shaft rotated in the rubber damper resulting in an out of phase condition. Found a used shaft with 26K on it cheap.

Dale

[bikerfish1100]

Paul,

What does "phased" mean.

front and rear u-joints must be in a correct alignment, otherwise the bike gets a "thrumming" vibration.
do a search for pics & such.
if your driveshaft/rear end have not been seperated, your bikes' joints should be correctly phased. it becomes a concern when pulling either end of shaft assembly that things are put back together correctly. easy to do right, but easy to do wrong (50/50 odds) if you're not paying attention to it.

[58058D]

If yours have not been pulled, they may or may not have been balanced at the factory. Mine on my K1100RS....maybe, or maybe they were reinstalled unbalanced by the dealer on one of the many occasions they had to work with it, but at about 75k, the U at the final really let go. (My photos are just like oilhead110's only with a handfull of metal shavings in the boot...) Shortly after, and before I fixed it, I read one of Paul's articles and learned how to balance or phase them properly. The article noted that he had seen unbalanced setups on reportedly 'virgin' shafts, and I made sure to get mine right. That bike NEVER felt that smooth before. Any time I had my K1200RS apart, I made sure to correctly phase the U-joiints upon re-install.

[tjg79]

I read one of Paul's articles and learned how to balance or phase them properly. The article noted that he had seen unbalanced setups on reportedly 'virgin' shafts, and I made sure to get mine right. That bike NEVER felt that smooth before. Any time I had my K1200RS apart, I made sure to correctly phase the U-joiints upon re-install.

Is there a link to the article by chance? I need to disassemble my rear drive and don't want to make any regretable mistakes.

[bikerfish1100]

try searching using some concoction of the following terms: "u-joint". "phasing" alignment'. driveshaft.
look here, pelicanparts.com. advrider.com. ibmwra, wtc. pics exist, along with work descriptions.