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Proper maintenance will greatly prolong the life of the shock. The entire shock should be frequently lubricated with WD40, espe-
cially the shock shaft. Always spray shock after washing bike. Frequent cleaning and regreasing of the top and bottom bearings will
greatly prolong their life. Be sure not to damage the bearings or shaft seal using a pressure washer. Replacement bearings for the top
and bottom are available from Action Racing.
Under racing conditions, the shock should be serviced after every 30-40 hours of use. Regular service will help prevent costly
damage to shock internals. Shocks can be shipped directly to Curnutt for servicing and repair. Allow 2 weeks for service and ship-
ping. For tuning and servicing information, contact Action Racing or Curnutt Shocks at 310-538-3789. See contact information on
page 44.
When calling about your shock or returning it for service, make note of the shock’s serial number which will identify the specific
valving and construction of your shock. Also be prepared to supply the rider’s weight, ability level and performance of shock.
Shock removal -
To remove rear shock for service, support bike with rear wheel off ground. Remove seat and shock splash guard.
Drain coolant, and detach hose from water pump to allow shock reservoir hose to pass. (DO NOT loosen or remove shock reservoir
hose from shock or reservoir, it contains very high pressure!) Remove rear wheel. Remove lower shock mounting bolt, spacer and
washers. Cut ties holding shock reservoir. Remove upper shock mounting bolt and spacer washer, then angle bottom of shock rear-
ward and withdraw from bottom of bike.
Reassemble in reverse order. Note that upper spacer washer is installed on left side of shock. Torque top and bottom shock mount-
ing bolts to 33 ft/lbs. Note that the top shock mounting bolt should be inserted in the rearmost mounting hole. Use new heavy duty
tie straps to secure reservoir to frame. Fill coolant and recheck after running engine.
Swingarm removal
- Remove lower shock bolt and spacer. Remove rear brake pedal bolt and lay off to side. Remove caliper assem-
bly from swingarm, and detach brake cable clamp from swingarm. Remove chain or unbolt chain guide from swing arm. Try to
move swingarm up and down and side to side to check for excessive play or binding. Loosen and remove the swingarm shaft nut on
the left side of bike using a 19mm socket. Prevent the bolt from turning by using a wrench or socket on the other side of the bike.
Remove bolt from frame and remove swingarm from motorcycle. Do not lose washers, take note of their positions. Note that thick
washers insert into inside of swingarm adjacent to engine case. Clean and inspect swingarm bushings and sleeves closely. Replace
bushings or sleeves as needed. Grease well with waterproof grease before assembling. Assemble in reverse order. Torque swingarm
pivot shaft to 37 ft/lbs. See illustration III.65.
Steering bearings
- The steering bearings need to be checked frequently for play or binding and adjusted and regreased as needed.
To check for play, put the motorcycle on a stand with the front wheel off the ground. Grasp the bottom of the fork tubes and push
forwards and backwards to check for play. Turn the wheel side to side from lock to lock to check for binding or excessive effort. The
bars should turn smoothly from side to side with almost no resistance to turning. The steering bearings should be greased at least
once a year, much more often in wet conditions or with heavy usage. To adjust the steering bearing tension, loosen the top triple
clamp fork tube bolts. A special wrench is available from your local dealer or Action Racing to loosen the steering stem nut. Snug
adjusting nut just enough to eliminate any freeplay and provide a smooth turning action with only slight resistance to turning. Note
that the play will decrease further when steering stem nut is tightened. See photo III-66. Tap top clamp with a plastic mallet to seat it
against adjusting nut. Tighten steering stem nut to 18 ft/lbs. Tighten upper triple clamp fork bolts to 11 ft/bs.
To access the steering stem bearings, remove the front wheel, forks, front number plate and fender. Remove the handlebar pad and
clamps. Lay the bar carefully on top of the seat, tape in place if needed. Remove the vent tube and cap from the top of the steering
stem. Using a 36mm socket, remove the steering stem nut and upper fork clamp.
swingarm
engine cases
lubricate
frame
thick washer
nylon bushing
steel sleeve
Note: lubricate shaft, inside of sleeves and engine cases lightly with antiseize or grease.
Diagram of swingarm assembly. Note positions of washers. Clean and regrease as needed for proper function.
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