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Probably the reason the fork seal is blown is too much air pressure. Definitely fix the seal and put in the correct amount of oil. You do not have to put air in to the front forks if you do not want to. To properly set up your suspension, set your rear shocks first, hard for two, soft for one, etc. Now load the bike, you or you and the passenger. With the front forks set to near max pressure (only 12 to 14 pounds air pressure do not go over max recommended pressure) bounce on the motorcycle seat and bleed off the pressure in the front forks till the front and back of the bike drop together. This is the correct way to set up your suspension. A bicycle foot pump with a pressure gauge works best works best. You will be near max pressure in one small hand squeeze of the foot pump. You will find it only takes 7-8 pounds of pressure to set up your bike. Just remember, You do not have to put air pressure in to your front forks, they will work just fine. You just wont benefit from the adjustable design.
it s something you can do yourself if you're mechanically inclined and pay attention to detail. there are some special tools you need, such as a fork spring compressor, fork seal driver, and snap ring pliers if you don't have any. the internal parts in the fork must go in the same way they came out, and all parts should be cleaned prior to reassembly. you should also consider replacing the bushings along with the fork seals and dust covers. might really want to consider letting a professional do it so that way the forks still don't leak after you put in the new parts.
Each fork has an outer dust seal, and an inner seal inside of that. Dirt gets between the seal lip and the fork slider and causes the oil to escape. The fix is to have them (Both sides) replaced. You need a fork seal driver tool (Size specific for the size of the fork) and something to measure out the oil amount. It's not an easy job, if you have never done it. Also... if the oil has never been changed, it's due.
to remove seals you will need to remove each fork leg from the bike,i put the bike on the centre stand and jack under the motor to get the front wheel off the ground,after you remove the fork leg,remove the dust cover(if fitted),remove the circlip holding the old seal,you may have to stab through the old seal with a screwdriver to remove the seal from inside the leg(be carefull not to damage the chrome on the fork leg),clean around the surfaces and install the new seal making sure it goes back in dead square,refit the circlip,then refit the dust cover,replace fork tube back in bike and top up with new oil,most bikes take between 300 to 500cc of oil,but check with your local shop as all bikes are different,and you can adjust the amount of rebound damping by varying the amount of oil you put back in,..sounds complicated but quite an easy job..hope this helps
If you get the sevice manual or contact a dealer to get the correct oil amount for your bike, they need to know the model and year, you have to have the forks off the bike. take the fork caps off, take the springs out compress the upper fork tube all the way and add the specified oil. if they also give you the measured amount from the top that's the best way to get both fork oil levels exact. there is a special tool that you set the oil level in millimeters and it sucks out the oil to the right level, but before you do that step after adding the oil always pull and push on the cartage rod several times to remove air from the cartage tube. you will hear the air coming out and you will feel the changes in the cartage rod as the cartage tube fills up with oil and the air is removed.
something i'm confussed on though is if you replaced a seal you would have had to brake down the fork to replace it. you would have poored the oil into a container, cleaned all the internal parts,and used a fork seal driver to install the new seal. part of your question asks where do i put the oil in? thats in the open end of the fork after you have taken off the fork cap. It sounds to me like you only replaced the dust seal on one fork. that is not going to fix your leaking fork. you need to replace the oil seal thats pressed inside of the top fork tube.