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Author Topic: rm 400 1980 fork oil quantity  (Read 2160 times)

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Offline LeighW

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rm 400 1980 fork oil quantity
« on: August 20, 2014, 05:23:02 pm »
 hi all does anyone know how much oil is in the forks cheers leigh
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Offline Slakewell

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Re: rm 400 1980 fork oil quantity
« Reply #1 on: August 20, 2014, 05:37:53 pm »
This is were you should start with forks , all forks this is how to start to set up forks. Allot of people seem to ask the same question.
Go to super cheap and buy a 4 litre auto trans oil ATF which happens to be around 15 weight.
Take your springs out and fill the tubes till its 150mm(6inch) from the top. Go and ride your bike and see how that feels.
If the forks dive to much under braking and settle a bit to low mid corner add some more oil 20mm at a time.   
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oldfart

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Re: rm 400 1980 fork oil quantity
« Reply #2 on: August 20, 2014, 05:54:38 pm »
15 w fork oil   with a 175mm air gap  ~ Std springs pilot 88kg plus  riding gear -  works fine  for me  ;)
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Offline Davey Crocket

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Re: rm 400 1980 fork oil quantity
« Reply #3 on: August 20, 2014, 06:07:25 pm »
Std springs on those are about .33kg, way to soft, especially when they are 35 years old. You want the springs to be about .44kg like a modern bike. The oil level is what Mick and oldfart says but oil wont fix soft springs.
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