Honda parts fiche shows a center stand for the cb250 but it may have been optional? If it’s there pretty easy to support the bike with a jack under the front engine mount and pull your front wheel,fender and forks. Loosen top clamp and then break fork cap loose as it’s much harder after forks off bike. After fork removed unscrew fork cap with your hand above so it doesn’t fly out and remove some human parts. Getting ahead of myself here. The fiche shows oil drain screws on the bottom out side of the fork outer/ slider. You could drain from there first by putting a drain pan there, removing the screw and pumping the forks up & Dow. Or continue and drain when fork cap off. If you do that the spring will come out so prepare to catch it when you invert the forks off bike. At this point I usually invert the fork and prop it up so it can drain for 15-20 minutes. Then you’ll want to take an impact with a 6mm Allen bit I believe and remove the bottom bolt. If you don’t have access to an impact driver use a long breaker bar will you shop assistant jams the damper rod with you custom made broom handle.
Sometimes the copper seal washer will remain up in the fork but a pick will usually retrieve it. Advise you replace that seal washer after clean that area and bolt. As I don’t see any replaceable slider bushings on the fiche you should be able to pull the fork tube out and the damper rod will fall out with the top out spring. If you go to any Honda dealers website that gives access to the parts listings you can see how all these parts go together. There will also be a cylindrical conical piece at the bottom inside the fork outer or it may be stuck inside the bottom of the fork tube. Clean everything with contact cleaner or mineral spirits and then run an old T-shirt rag thru the fork tube and the fork outer until it’s clean. Fork tube should be free of nicks or gouges in the surface. I polish chrome fork tubes with Simichrome metal polish. It will get all the grit out and help reduce friction between the tube and the seals. The upper or dust seal will come out with a careful pry with a flat blade screw driver. Under that you should see the bent looking clip that holds the fork seal in place. There’s usually 4 kinks in the clip where you can use a pick or small screwdriver the remove it. Start at one end and it will come out by the 3rd kink. Slide it off the tube, DONT pull it apart to remove from the side. Now you should be able to pry out the fork seal. I have a aluminum jaw vise so I drop the fork below the plane of the vise top and can pry using the edge of the vise. If you don’t have something similar you can use a long wide blade screwdriver. Put the blade under the seal lip and support the screwdriver with something, wood shim or several folds of cloth and pry carefully. The seal should stat coming up and pop out. There should be a big flat washer under. Remove and thoroughly clean the area the new seal will go in.
If you stayed with me this far the rest is easy or as the service manual says assembly is the reverse of disassembly. After everything clean, take the damper rod with,apply a little fork oil on the plastic piston ring at the top of the rod and the slide the top out spring on from the bottom. Hold fork tube horizontal and slide the damper rod in. Use the damper rod holder (broomstick) to push the rod to the bottom. The damper rod should protrude from yea bottom of the fork tube.slide the oil lock on, tapered end goes into the fork tube. Then the whole works goes into the fork outer. Do this held horizontal until fork stops. Look into hole where bottom bolt goes, you should see the threads of the damper rod if it’s all seated correct. I use the broom stick to spin it to make sure everything in place. Install bottom bolt/seal washer into damper rod and torque to 25 lbs/ft. Once again may have to use broomstick to prevent spin. Now stand up verticallyfork tube bottomed out. A big vise with soft jaws is preferable but even a wood working vise would work. Wrap some vinyl electrical tape around the top edge of the fork tube after you drop the big flat washer onto the fork tube, bevel edge down. Then use a small amount of light seal grease or fork oil inside the seal lips and rotate it carefully onto the fork tube. Push it as far down as you can. If you have a seal driver you can easily seat it until u can clearly see the land for the clip. If you have driver u will hear the change in impact sound when the seal is seated. Install the clip making sure it’s in the groove all the way. Then you can just push the dust seal on. Pour in the required amount of fork oil, then the spring and cap, done.
