Question about Honda CB 750 Motorcycles

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Fork oil spec - CB 750 Honda Motorcycles

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Fork oil can be from SAE5 to SAE 30 depending how hard you want the fork to rebound. The amount in each fork will differ by about 25-35cc, normally each for runs from 285cc to 355cc.
You can mix a lower SAE with a higher to get the SAe you wanted. Standard SAE used for fork oil is 10 which is equivalent to the thickness of DOT-3 car transmission oil. If good enough, please rate this free advise

Posted on Sep 02, 2010

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robotleg
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SOURCE: torque specs

what size bolt heads on these bolts (the bolts size chart for correct torque specs is 2mm smaller than the head of the bolt on Kaw).while the forks are still off and the end caps also still off,hold them level (up/down) and by hand (which will be easy because the caps are off to let the springs come out past the tube-but leave them in as they change the amt. of fluid goin in)push down slow to compress and bottom them out then fill till you get 100mm from inside the top of the forks tube is on the mark.then pull them back to fully extended ,put the caps CAREFULLY back on so they dont stripp the soft threads up.P.S.if this was used at a track there are 2 inexpensive brass or copper bushings inside the big tubes top and a bit lower that will get worn and let the inner fork tube **** back and fourth as it compresses in and out that causes the seals to leak again very soon because it flexes the round inner part of the fork seal to become out of round (not tight all around the tube for correct sealing) from slack and to much movement from the above mentioned cheap bushings wear.I cut em out with a dremmel and freeze the new ones for easy insertion with fingers to not nick em from tappin in with a hammer,etc.good luck,wallace

Posted on Jul 26, 2009

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SOURCE: What are the specs for how much fork oil I should use

call a bike shop they can tell you how much oil or how far to fill them just make sure you have the fork compressed before you put the oil in.. and the spring has to be in before oil

Posted on Aug 30, 2009

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1 Answer

How much fork oil do I put in


Dave, I usually measure the amount of fork oil that drains out of each fork and replace with that same amount. In my experience this is not necessarily a critical spec. All bikes are different, however. Many owners and mechanics will experiment with differing amounts and weights of oil. You may consult your dealership and try to get within a couple ounces of spec. Herb.

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1 Answer

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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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1 Answer

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G'day. When I'm in trouble with a fork oil quantity spec.I use the oil level method of setting up my forks. The spec. is an oil level of 105mm from the top of the leg with the fork fully compressed(spring removed of course).Works every time.
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1 Answer

What is the specs for the fluid that the forks use


Best is to use recommended OEM fork oil in the SAE10 or SAE15 range like Castrol Fork oil-10 or Fork oil-15, as number gets higher so is the viscocity and harder it on rebounding. When filing the fork do not over fill as it would make the fork response very stiff and blow out your seals. Good enough free advise?

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1 Answer

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