SnowGoose

Sorry to resurrect an old thread but I ran across this one in searches related to my '97 Sport 1100i driveshaft... @Raz, when you said, "When putting the shaft together again, it's very important to line it up correctly, that is when the rear grease nipple is straight down, the two front nipples should point straight up. Failing this will cause nasty vibrations" where did you get that information? It is true that if you get it together wrong such that the u-joint yokes out of phase by even one spline it will definitely cause issues. I don't know if something changed from '96 but my '97-on Centauro/Daytona/Sport 1100i Guzzi factory service manual shows the zerks (grease nipples) all pointing in the same direction, on pg 136, diagram 15-19 when assembled on the bike, which is how I put mine back together last time I had it apart. I have now pulled it back apart to inspect/lube everything because I am getting a harmonic vibration starting at 70mph that cropped up since the last reassembly. The u-joints all appear to be fine (36k miles on the bike/driveshaft), as they should be because I keep them well greased and am very careful when washing the bike to keep water and soap away from them. Since I just now took it apart I am going to dig deeper into possible causes but had not heard that about the zerks.