Question about 1984 Yamaha XJ 650

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My dad is after a question for his bike please, he is dropping the forks out of his bike this weekend and he needs to now how much oil he has to put back into each fork please, thanks

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  • ckoira57
    ckoira57 May 26, 2010

    Really need to know the type of motorcycle. Make -model-year.

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Http://www.yamahaownershandbook.com.au/?r=0
Try this site for a free download manual for more than just the fork oil.
Cheers.

Posted on May 26, 2010

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Bike squeeks from front suspension


put a couple drops of oil on the stanchion tubes of the shock forks where they seals connect with the sliders and see if that helps. It is possible that inside the fork it has dried out and the spring needs some grease where it seats inside of the fork.

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In changing 2005 Harley Heritage Model FLSTCI fork oil, how many ounces of fork oil should I use? What does wet or dry mean?


I'm sorry but I don't have the specs on the quantity and type of fork oil for your year and model bike. I work on the older bikes that the dealers will no longer service. But, I can describe the difference between the "wet" and "dry" conditions of the fork assembly. If you take the front forks apart, clean them out, and put them back together with no oil in them, they are considered "dry". For a simple drain and refill type oil change on them where you don't get all the oil out of them, they are considered "wet". I hope this helps, You can call you local dealer's service department and they should tell you the quantity and viscosity of the oil that goes in the front forks on your machine. They'll tell you something like 6 ounces of "Type E" oil, for example. Harley-Davidson uses these types of specs to describe their oils. If you go to a website for fork oil, like PJ1, they may give a cross reference or equivalency chart for converting H-D "Type E" to their oil. I think that would be their 30 weight oil. If the front end seems too "stiff" with 30 weight, you can drop down to 20 weight. I think Honda makes a 25 weight but not sure. Your Harley won't mind the Honda oil. BG.

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Keep having leaking fork seals.have replaced seals and oil after every ride lately.(4)have tried two brands of seals last time disasembled whole of forks cleaned every part,shims everything and had...


G'day. A couple of suggestions-
Damage to the fork slider-chips or dings.
Too much oil in the fork on re-assembly can cause the seal to go.
Worn or loose fork bushes will flog the seal prematurely.
When you transport the bike-if you don't use a seal saver can pop the seals.

So let me help with these.

Be sure that the fork slider is not scored,dinged or damaged on th surface.

A good double check of the oil quantity is to ensure that when you have re-filled the tube with oil & primed it(worked the air out of it), the oil level should be 100 to 110 mm from the top of the leg to the oil with the fork fully compressed. If the level is less than this-drop it to 100mm.

To check the fork bushes-try pull on the front forks front to back(wobble) & feel for looseness in the bushes.

And finally-When you transport the bike-put a chock(I use an empty 5ltr oil container-but you can buy propper chocks from the bike shop) in-between the forks at top of the front wheel .
Now when you pull the front end down it will stop on the chock & stop the front forks being under excessive compression for extended periods-so it saves the fork springs from sacking out too.
I hope this proves helpfull.
Kind regards Andrew Porrelli

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Need to know the amount of fork oil in each fork please


Best to get a manual trust me my dad wuz in a comma for a week over fork oil!

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Blow-by of the left front fork 'seal' (Honda M/C 1981 cm400c)\r\nI also own 1980 (same) but it doesn't have the 'air' added on top like this '81. . . 1) question: ` Could I just drain the fork oil...


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.

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First of all do not add oil to your front forks with out draining them first. If you over fill your forks with oil you will damage your forks. To change your oil in your forks, first center stand the bike and lift the front wheel by putting a jack under the motor. Remove the front wheel and axle and put a pie tin under the fork tube. Reach up into the bottom of the fork tube with a hex key and loosen the screw but do not remove. Now take the air pressure cross over tube off, this will allow you to unscrew the fork tops( On some bikes you may have to put a towel on the tank and unbolt the handle bars to get them out of the way.). Pull the screws out of the bottom of the forks and gently pull down the oil should come out now. If you need new fork seals take the lower tubes off and replace(You may need to take off the fender and hang the calipers with wires.). Turn the lowers over and dump out the oil and reinstall fork lowers. Snug up screws and sealing washers on the bottom of forks you can not tighten till you put on fork tops. Now pour in measured amount of oil, again do not over fill. Put on fork tops and air crossover tube. Now tighten screws on bottom of fork. Finish reassembling bike.

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1 Answer

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Angela, do you have a Clymer, Hayne, or service manual for the bike? If not you should get one, there is a lot of valuable information in there even if you don't do all the work yourself.

Replacing the fork seal requires putting the front end in the air, disconnecting everything from the front wheel (brake lines, speedometer cable if there is one), and dropping the wheel and fork tubes CAREFULLY to separate the two pieces of the fork tubes. Then grab the old seal and replace it with the new seal.

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