bikertucker
New member
Just purchased a 1975 R90/6 two weeks ago. Did not go for more than a mile test ride because of in-op front brake. All seemed very well, except for front brake. After I rebuilt the master cylinder, went for first real ride. After about four miles when I came to a stop, noticed loud clatter / chatter from down below. Rode it home and made some checks. When engine cool, all purrs like a kitten. Very smooth, engine, transmission, clutch, seem to all be perfect. When first take off only sound is the exhaust. After four to eight miles is when the noises begin. When stopping at sign or traffic light at below 1500 rpm clatter / chatter begins, and it is loud. Doesn't matter if in neutral, or in gear, clutch in or out, noise is there all the time. At around 1500 rpm in neutral, or in gear taking off from dead stop, loud clatter/ chatter is there till 1500 rpm then all is quiet. Have tried research and many over the years have reported what sounds like the same noise, just varying hows and whens. Problem is no more posts were added giving what the problem or fix was. Have never heard this sound before on any other motorcycle with cam chain, transmission, crank issues. Since this is my first dry clutch motorcycle which happens to match the first time I have ever heard this kind of sound before, my guess is clutch issue of some type. Though, as at any time, I could be wrong. I have checked timing, set valves, sync'ed carbs, and adjusted the clutch, handlebar, and below correctly. The only thing which seemed to effect it was carb sync. Before carb sync, once engine was warmed up noise would be there all the time, from idle all the way to 5000 rpm while traveling down the road. Once synced, problem improved to 1500 rpm and below?? Have tried to isolate noise with stethoscope made for such things and all I hear are pleasing whirring, spinning sounds. But at the same time still hear the loud chatter/ clatter from the out side. I have been riding it anyway, it's so darn fun to ride. But I need to know whats going on and why plus how to fix it.
Thanks
Bikertucker
Thanks
Bikertucker