Greetings all
I have recently purchased a 1983 BMW R100RS.
The bike looks very nice, but suffers from neglect.
My short list of to do items are getting the engine to run better, bypassing the Pulse Air system and getting the brakes to work.
I have two sets of questions for the group. I have checked the compression and I am getting 110 on the left cylinder and 105 on the right (sitting on the bike).
This seems low to me. I am going to do a leak down test in a few days to see what that can tell me. What should I expect for compression on this year and model? How well does this model respond to higher compression pistons?
Secondly, the brakes were good enough to hold the bike still on a slight incline, but not functional for riding. The front brake lever would come back to the grip and the rear went all the way down. I took apart the calipers and cleaned them, then flushed the system. The front brake came back but still feels soft. The rear still goes to the bottom. There was no leakage from either cylinder. After removing both cylinders, I took them apart. The bore of the front cylinder is clean, with no pitting or distortion according to my gauge. The rear is clean as well. Here is my question. Should I consider the new Master Cylinder with reservoir or just go with the rebuild kit for the front?
Thanks for any feedback
Roy
I have recently purchased a 1983 BMW R100RS.
The bike looks very nice, but suffers from neglect.
My short list of to do items are getting the engine to run better, bypassing the Pulse Air system and getting the brakes to work.
I have two sets of questions for the group. I have checked the compression and I am getting 110 on the left cylinder and 105 on the right (sitting on the bike).
This seems low to me. I am going to do a leak down test in a few days to see what that can tell me. What should I expect for compression on this year and model? How well does this model respond to higher compression pistons?
Secondly, the brakes were good enough to hold the bike still on a slight incline, but not functional for riding. The front brake lever would come back to the grip and the rear went all the way down. I took apart the calipers and cleaned them, then flushed the system. The front brake came back but still feels soft. The rear still goes to the bottom. There was no leakage from either cylinder. After removing both cylinders, I took them apart. The bore of the front cylinder is clean, with no pitting or distortion according to my gauge. The rear is clean as well. Here is my question. Should I consider the new Master Cylinder with reservoir or just go with the rebuild kit for the front?
Thanks for any feedback
Roy