I use 120cc each side of medium but I have found that a little hard except on warmest days but my forks have modified two-way dampling internals from CBR600. Standard is 169cc each side.
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Begin by loosening the upper triple-clamp pinch bolts and breaking the fork caps loose while the fork is still held by the lower triple clamp. You will need to remove the caps to refill the fork tubes with oil.
Determine if the fork legs have oil drain plugs near the bottom of the legs. If they do, you are in luck and will be able to change the oil without removing the fork legs. Put old newspapers on the floor under the front end. Place a drain pan under the fork legs and remove the drain plugs, one side at a time. Hold the front brake and push down on the fork several times to pump the oil out. When oil stops coming out, reinstall the plugs using new sealing washers.
Without Drain Plugs
If there are no drain plugs (look carefully), you'll need to remove the fork legs to drain the oil. At this point you can decide to have it done professionally or do the work yourself. We'll cover the main, basic steps. Refer to a shop manual to learn all the exact procedures involved. Some motorcycles may require fairings, handlebars, etc. to be removed.
Support the motorcycle either on the centerstand (if equipped) or by using a motorcycle jack under the engine. If you use the centerstand, you may need to place a sandbag on the rear of the seat, hold the front end up using straps from the rafters, or support the bike underneath the engine. Use tie-downs to steady the bike on the jack. Grasp the lower fork legs and try to push and pull the fork toward the back of the bike and forward to check for loose steering head bearings. Inspect the pleated rubber fork boots, if equipped. Check for signs of fork oil leakage and any grooves in the fork tube wear surfaces where the seals make contact. Also check for looseness between the fork legs and tubes that would indicate bushing wear.
Remove the front wheel and axle assembly. Support and tie the brake caliper(s) out of the way. Remove the front fender and speedometer cable, if equipped. With the fork leg fully extended, remove the top cap from a leg. Be prepared as there may be some spring pressure pushing against the cap.
Loosen and remove the pinch bolt from the lower triple clamp and lower the fork leg. Note any shims or washers and spring. Turn the leg upside down in a drain pan until oil stops flowing out. You may have to move the damping rod in and out to get the oil out. Repeat the procedure for the other side.
Reinstall the fork legs and other removed components in the reverse order of removal.
All Models
Add the exact amount and type of oil recommended by the manufacturer. Some motorcycles call for the use of a dipstick to determine how much oil to use instead of just pouring a certain amount of oil back in. Follow the manufacturer's shop manual recommendations.
Carefully install the threaded top caps by hand to avoid cross-threading. Tighten the pinch bolts and top caps to the factory-specified torques. After the brakes are installed, pump up the lever until the brakes feel normal again. Once the bike is assembled and on the floor, push down on the front end to verify the suspension's response. Turn the steering from its left to right limits to ensure nothing is binding, and check all controls including the throttle for proper operation.
Remove forks from bike, with each fork remove end cap and drain plug over a bucket drain oil from each fork reinstall drain plug on lower leg, replace oil thought top of the fork to spec, replace end caps and bleed oil from forks
You may not have enough oil in the front forks or you may been a heavier viscosity of oil. I'm sorry but I don't have the oil capacity for your "Low Sportster". All I have is for "Hugger" models. They take 10.7oz. "wet" and 12.1 "dry". The difference between "wet" and "dry" is that if you simply drain and refill the front forks, it's call a "wet" oil change. If you disassemble and clean the forks of all oil inside, it's called a "dry" oil change. Contact the service department of your local shop and ask them how much oil goes in the front fork. To change the oil, there is usually a small screw in the trailing side of the lower fork slider down near the axle. Take these out and the oil will drain to a certain degree. Hold the brake while working the forks up and down with your weight to get all the oil that draining will get out of them. If you want all the oil out, you'll have to disassemble the fork tube. I would not do this if the seals are not leaking. Replace the screws in the sliders and then remove the top cap from one tube at the time and refill the tube with the specified amount of oil. Sometimes, the top caps can be difficult to get back in due to the pressure of the large spring in the front fork tubes. You may need a tool to compress the sping. I'm not sure on the "Low" model. I've always managed to the top caps back in without any special tool but I've never done a "Low" model bike. Harley uses what they call their "Type E" fork oil. I do not know what the viscosity of this oil is so I always use PJ-1 30 weight fork oil for most applications. Use only fork oil as any other oil may have a tendency to foam thereby negating any dampening action of the forks. If this doesn't solve your problem, you may want to check into changing the springs in the front forks. Progressive Suspension and others make kits for this.
lower for legs there should be a drain bolt for each leg do one side at a time. Take the top fork cap off be careful the top cap is spring loaded get a pan to catch the oil,remove the drain bolt let it drain.reolace the drain bolt then you can add your new fork oil,check your owners manual for the proper amount and weight oil you need to replace, replace the fork cap. repeat steps on the other fork.
The easy way is to remove the top caps from the forks, then the springs. Compress the forks to the stops and then fill the forks to 150mm(6inches) from the top. Refit springs and caps and you are ready to ride.
First, drain the oil. There is a nut ont he side of the for to do this.
Now you have to remove the wheel and fender. remove the top cap to the
fork. Inside the bottom of the fork is a allen head bolt. Remove it and
the lower fork will slide off. You put the oil in at the top cap. Use
the Harley fork oil.
Good luck and happy riding
each fork takes 11.5 ounces of folk oil, and for a 91, use heavy duty fork oil, they fill from the fork tube caps, remove them from the top of each fork, support the bike so the front wheel is off the ground, tighten the Caps to 40 -60 lbs when yer done
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