Georelle
XS650 Enthusiast
Well I finally decided to overhaul the motor on my 76 bobber. It was running well and has plenty of compression but there was a rattle. I would get a rattle at a certain RPM, unfortunately I am not sure of the RPM because I don't have a tach. But it would do it right around 60mph and if I adjusted the throttle speed it would go away. It sounded like a tapping noise on the case. It did it in more then one gear also.
When I searched the forum for the symptom it sounded like the problem was probably either the front chain guide plastic came off or the rods. Well the front chain guide is ok, the plastic is coming off in some places but not the cause of the rattle.
The rods look good so far. The piston wrist pins show very little wear. I have not taken the crank apart yet to check the bottom end but I can't imagine the bottom end of the crank could be worse then the top.
When I took the right case off I found the metal parts in the picture. The washer is suppose to be round but it looks like it got pinched in something. All parts shown are magnetic so they almost had to come from the right side otherwise the oil plug magnets would have grabbed them. There was also another piece of metal about the size of the larger one that I lost. I think it was cast aluminum however. My friend and I searched the entire motor to see where these parts may have come from but haven't come up with anything.
The motor overall shows very little wear. The cylinders have almost no lip and the rings measure well with in tolerance when put in the cylinders. shift forks look great as well.
Any ideas where the parts may have come from or what may have been causing the noise? All help is greatly appreciated.
Thanks
Georelle
When I searched the forum for the symptom it sounded like the problem was probably either the front chain guide plastic came off or the rods. Well the front chain guide is ok, the plastic is coming off in some places but not the cause of the rattle.
The rods look good so far. The piston wrist pins show very little wear. I have not taken the crank apart yet to check the bottom end but I can't imagine the bottom end of the crank could be worse then the top.
When I took the right case off I found the metal parts in the picture. The washer is suppose to be round but it looks like it got pinched in something. All parts shown are magnetic so they almost had to come from the right side otherwise the oil plug magnets would have grabbed them. There was also another piece of metal about the size of the larger one that I lost. I think it was cast aluminum however. My friend and I searched the entire motor to see where these parts may have come from but haven't come up with anything.
The motor overall shows very little wear. The cylinders have almost no lip and the rings measure well with in tolerance when put in the cylinders. shift forks look great as well.
Any ideas where the parts may have come from or what may have been causing the noise? All help is greatly appreciated.
Thanks
Georelle
