Step 6 : Measurements are taken and construction of the swinging arm start. I am going to reverse the
way the NSR 80 swinging arm is put together by putting the bearings in the frame rather than the swinging arm.
Firstly I am making the bearing housing to replace the current swinging arm tube that is on the 90 frame.
This is the picture of the current setup on the NSR. The bearings sit into the Swinging Arm.
Turning a new swinging arm pivot with recesses for a push fit of the bearings. This will be welded into the Cub 90 frame.
New setup (Bearing not pushed in flush), and the swinging arm bush left 1.5mm longer
Step 7: Making the jig for the new swinging arm. This was very slow and painstaking. Measure, measure and re-measure.
Step 8: Making the stainless steel eccentrics for the back axle to adjust the chain. It will give me 18mm adjustment.
Step 9: Making the Eccentric Houses and Bushes for the front of the swing arm
Step 11: Best Laid plans and still had to widen the jig. Then bending the steel for the swinging arm
Problem 3: Axle too short. Extra 30mm needs to be added.
Problem 3 Solution: Cut / Pin with Roll pins / Weld / Turn down in the lathe
Step 12: Turning out 28mm hole for front bush. Swing arm roughly in place.
