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post #1 of 11 (permalink) Old 02-24-2007, 01:02 PM Thread Starter
 
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Fork Oil

I had stripped down the fork so that I could powder coat them, and now I am reassembling them. According to my calculations I need about .522 litres, or 18 oz of fork fluid per fork. On some of the older bikes that we have the manual says that you can use a certain kind of hydraulic fluid but I'm slightly hesitant except for the fact that fork oil is expensive. Is using hydraulic oil cool or what?
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post #2 of 11 (permalink) Old 02-24-2007, 07:36 PM
 
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Not hydraulic fluid, but automatic transmission fluid. Not sure which one though. And a better way to measure the fluid is by measuring the level from the top of the tube with the spring out, and the tube vertical. Most are around 6 inches, but the manual should state what the level should be. Both tubes should be exactly the same.
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post #3 of 11 (permalink) Old 02-24-2007, 08:42 PM Thread Starter
 
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110mm, but I was using the litre/oz measurement cause I want to know how much I should buy, and since it is just over half a litre per fork that means I'll have to buy to bottles = $40.
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post #4 of 11 (permalink) Old 02-24-2007, 09:38 PM
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automatic transmission fluid, I rebuilt about 5 sets forks for customers (looking to cut cost) with using it, and it has work perfectly.
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post #5 of 11 (permalink) Old 02-24-2007, 11:40 PM Thread Starter
 
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just any kind of Automatic transmission fluid?
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post #6 of 11 (permalink) Old 02-25-2007, 12:41 AM
 
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I recomend Dextron III/Mercon. That is what I use for my bikes. Make sure that all the parts are extremely clean, a small piece of dirt will cause a leak.
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post #7 of 11 (permalink) Old 02-25-2007, 08:27 AM
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WHY!!!!!

The fork oil isn't that much! And to go thru all that effort to do the work and cheap out on the oil! COME ON!

I would rather put a cheaper fork oil in then something else!!

Here's Repsol Moto Fork Oil

ONLY $4 a bottle! Probably only need a hair over 3 bottles!!!!

I would use the $27 bottle of Ohlins myself...




-Chris
aka Gas Man



Was: 2002 Kaw ZX-9R
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is me till the
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post #8 of 11 (permalink) Old 02-25-2007, 09:07 AM
 
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I went both routes (atf vs. fork oil) on my dirt bike, and had much better results with the correct weight fork oil. The atf didn't ride as well, and leaked slightly around the seals. The correct weight fork oil at the specified air gap level did wonders (rode great, no leaks). Granted that was a dirt bike, but the same should apply to a street bike. Also, if I'm not mistaken, a quart of quality Bel Ray fork oil only costs ~$6.

The key with any type of forks are using the correct weight oil, and achieving the correct air gap in the fork. If atf is the correct weight, then it should be fine. However, why take a chance over $10-$15?
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post #9 of 11 (permalink) Old 02-25-2007, 10:06 AM Thread Starter
 
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I wish I lived in the states, cause fork oil (and pretty much any kind of oil) appears to be alot cheaper. Alright then, thanks for all the advice.
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post #10 of 11 (permalink) Old 02-25-2007, 12:15 PM
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Quote:
Originally Posted by 6doublefive321 View Post
I went both routes (atf vs. fork oil) on my dirt bike, and had much better results with the correct weight fork oil. The atf didn't ride as well, and leaked slightly around the seals. The correct weight fork oil at the specified air gap level did wonders (rode great, no leaks). Granted that was a dirt bike, but the same should apply to a street bike. Also, if I'm not mistaken, a quart of quality Bel Ray fork oil only costs ~$6.

The key with any type of forks are using the correct weight oil, and achieving the correct air gap in the fork. If atf is the correct weight, then it should be fine. However, why take a chance over $10-$15?


Also, your sig is money double5... I love Primus...
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post #11 of 11 (permalink) Old 02-25-2007, 08:10 PM
 
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Also, your sig is money double5... I love Primus...
Claypool is the man. If you haven't seen a live show with him regardless of which band he is with, you are missing out.
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