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my old Ford Cortina.
This is from a pretty new BMW (R100GS Yr, '88):
...at 67,000 miles. The sealed (!) bearings seized and split the metal claw which holds the bearings. At that time I was playing with the idea to have it repaired (e.g. http://www.brunos.us) but decided to go with a new one in the assumption that an OEM shaft is better balanced (wishful thinking!).
/Guenther
Most Airhead driveshafts go a very, very long time.
MY old Cortina... . 1966 Lotus MkI.. .. still kicking my a$$ for EVER selling it!!!
In typical trim the deflection angles of the U joint exceeds the prudent deflection angle which puts stress on the U joint and they fail early. There are specialist shops that rebuild them with grease fittings. This helps but they still fail too soon because of the excessive deflection angles.
This is from a pretty new BMW (R100GS Yr, '88):
...at 67,000 miles. The sealed (!) bearings seized and split the metal claw which holds the bearings. At that time I was playing with the idea to have it repaired (e.g. http://www.brunos.us) but decided to go with a new one in the assumption that an OEM shaft is better balanced (wishful thinking!).
/Guenther
The angle at the front of the shaft is too great an angle. They fail there often. The interesting thing I have observed over the years is that the really big folks loaded for camping around the world have longer driveshaft life. But that heavy load squats the rear of the bike downward and straightens up the driveline angles. A short shock does the same thing.snip
I sent it off to Hendersen Precision in California. They put it back together with replaceable joints and a grease nipple for periodic re-lubing.
Anyone else have any experience with Henderson?