Hi, was almost on the way to purchase a OTR Clutch Slave Cylinder till I read this thread.Found the problem.... Measured the depth to the piston in the slave through the banjo fitting hole with the spring installed on the OTR slave. Fully compressed is ~0.670”. Removed the spring and installed the slave dry and pushed the piston in against the clutch rod and got a measurement of ~0.578” showing when the return spring is fully bound is causing a 0.092” interference or preload on the release rod. This would definitely keep the springs from fully applying pressure on the clutch pack. Going to trim a coil, verify compressed depth through fitting hole and retest.
Am on Barnett's w/ medium springs all round.
By your findings, does it mean:
1) have to carry out the modification so both parts can suit each other?
2) how is your review/feedback of the clutching after the everything is in order?