Gyrobob
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Posers ain't motorcyclists
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Newnan, GA
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Belt adjustment procedure.
Reply #142 - 10/05/12 at 08:10:38
RYCA CS-1 belt adjustment procedure
This is important because the swingarm on a RYCA conversion never does get level. As the shocks compress, the rear axle keeps moving rearward, so you have to make sure the belt is not overtight when the rear suspension is compressed as far as the shocks allow. With standard RYCA shocks, their range of movement is 11" to 13" as measured between the shock mounting point.
This procedure will adjust for the max tire/swingarm clearance without overtightening the belt, which is an important issue when the RYCA modified swingarms are used with larger diameter (4.00 - 18) tires.
1. Chock the front wheel and get the rear wheel into the air using a jack or some other support for the frame. 2. Undo the tops of the shocks, and tilt them out of the way. 3. Lower the bike carefully so the tire contacts the floor. Adjust it so the distance between the centers of the shock mounting points is 11 inches (or whatever the distance is for max compression of your shocks, if you didn't use standard RYCA shocks which move from 11 to 13 inches). 4. Loosen the axle just enough so you can move it fore and aft using the belt adjuster bolts. If you loosen it too much, when retightened, the swingarm gets a tiny bit longer, making the belt tighter. 5. Allow the axle to move forward a little (~ 1/16") to a loose belt position. The final movement of the axle should be from a forward position moving aft using the belt adjuster bolts. 6. Adjust the axle so the belt is moderately tight. -- The belt should be just tight enough to permit twisting it 45 degrees. -- Make sure the pulley is aligned with the belt by placing a straight-edge along side the pulley to verify it is parallel with the edge of the belt. The little adjustment marks on the outside rear of the swingarm are not very precise. 7. Tighten the axle back up and, with the shock mounting points still at 11 inches, recheck the belt tightness. It should be fairly tight (45 degree twist), but not rigid. 8. Without turning the belt adjuster bolts, tighten the belt adjuster nuts. 9. Check the clearance of the tire and swingarm. There should be at least 1/8" between the tire and the swingarm, and the tire sidewalls should be about the same distance from the inner surfaces of the swingarm. This is not a very precise item. 10. Jack the bike up so the distance between the shock mounting points is 13 inches (or whatever the distance is for max extension of your shocks). 11. Re-install the shocks. 12. Lower the bike (the belt will seem fairly loose) and ride away. 13. After the first ride, recheck the adjustment to make sure nothing moved.
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