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TOPIC: Change of front fork oil

Re:Change of front fork oil 1 year 9 months ago #93389

  • Ryderod
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I'm no suspension fundi at all so personally I'm more comfortable with slight oil weight changes on decent usd forks as there can be adjustments made to get compression and rebound working together properly. I have not ever deviated from 10w oil on any basic non adjustable telescopic fork.
Not getting the search right on Tapatalk, but Wookie's post on this thread, and a previous post explaining the limitations of the stock fork and how the damping works only via the orifice makes 100% sense.
I'm not sure on the amount of oil I use, I guess around between 450mls - 500mls per side, I rather measure the air gap with the spring out and the fork compressed. I make this 170mm. I think that is borderline going on max oil level as I think std is 190mm air gap.


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Re:Change of front fork oil 1 year 9 months ago #93394

  • capeklr
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Hi Etienne, as Ryderod has said it is not to difficult.
Very important, he also mentioned this loosen the top fork clamps and then loosen the fork cap. I have seen damaged threads on the fork cap if this is not done!
Support the bike, take out the front wheel and forks and as he explained get the old oil out and flush.
Standard fork oil spec for the KLR is 10w, do not go thicker as this will slow down compression and rebound.
You can if you like use 7w this will make the forks respond quicker and also be a bit smoother on bad corrugations, but if you push hard on a tar mountain pass you might experience that the forks are to soft.
Filling the forks I always go on the air gap.
Fork upright in vice, no spring, after adding oil bleed the forks by slowly pushing up and down through the full stroke to get out any air bubbles and then measure with fork completely collapsed.
190mm is a good basic setting. I have gone to 180mm on my KLR and it got to hard. I often set it to 200mm for riders that are not to heavy.
Be careful when replacing the fork caps as these like to cross thread.
Have fun.
"The world is a book and those who do not travel read only one page."
St Augustine
Last Edit: 1 year 9 months ago by capeklr.
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Re:Change of front fork oil 1 year 9 months ago #93395

  • Darknight
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Thanks Guys! It is definately a must for me to do since they have'nt been looked for 50k kms or since i bought the bike new. And they feel too unresponsive for me and soft.
#The Dark Knight

Black KLR 650 '12

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Re:Change of front fork oil 1 year 9 months ago #93398

  • Wookie
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There is a difference between the 38mm (pre 2008) and the 41mm (post 2008) forks internally
The 38mm forks have a hex impression in the top ofthe damper rod so you can make up a tool using a thread bar and some nuts to stop it spinning.
In the 41mm forks the damper rod top is smooth (no hex impression). To hold this use a softwood broom handle with a taper cut to the end.
Stand the fork upright and tap the taper home in the damper rod using a rubber mallet..... gently does it as you don't need to much friction to hold it.

Also make sure you get the bottom-out cone and small spring at the bottom end of the damper rod installed correctly when you reassemble the forks.
Last Edit: 1 year 9 months ago by Wookie.
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Change of front fork oil 1 year 9 months ago #93472

  • Dieseldawie
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Like ORlando says..fork seals will cost you less than the price of the oil. One dustcover and a clip and forks come apart

on my way to Groenie now to do mine..

Tip is to keep everything clean
I like to drink lots of beer??
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Change of front fork oil 1 year 9 months ago #93476

  • Darknight
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Hi Dave,

Please PM me Groenies number.

Thanks
#The Dark Knight

Black KLR 650 '12

*Live to Ride. Ride to Live*
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Change of front fork oil 1 year 9 months ago #93512

  • Dieseldawie
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Took a few hours and was done. Transalp has very weak seals and was less than 8 months ago since I last did them and changed the oil. I could not believe how dirty and black the old oil was.
I like to drink lots of beer??
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Change of front fork oil 1 year 8 months ago #93752

  • Darknight
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Just a quick dummy question on the oil capacity. I know that the manual says 500ml's per side. But fully drained I got 600ml's, why is there such a big difference between drained capacity and what you replace?
#The Dark Knight

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Change of front fork oil 1 year 8 months ago #93753

  • Shadow
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I followed all the instructions when I did mine (new shape) and I had to go and buy more oil because the 500ml bottle wasn't enough, ended up with about 300ml per side
Remember yesterdays braai, look forward to todays braai, and hope for tomorrows braai.
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Change of front fork oil 1 year 8 months ago #93754

  • Wookie
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Don't work on oil quantities when you change the oil.
rather work by measuring the oil height.
This is done from the top of the stanchion tube with the fork fuly compressed , vertical and the spring removed.

The oi height is the important factor so as to get the AIR GAP correct when the fork is fully assembled again.
Last Edit: 1 year 8 months ago by Wookie.
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