F850GS Fork Guts Re Assembly
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- Опубліковано 3 лис 2024
- 2019 BMW F850GS - After repairing/replacing the fork seals on the right fork, it's time to re-assemble both the right and left forks. And they are TOTALLY different beasts mechanically. We'll step through the addition of fork oil, measuring properly, and how to re-assemble without any special BMW tools for compressing/tensioning. It takes a bit of patience, but it is quite do-able. The only things remaining are to re-install the forks and then re-install the front wheel and fender. Success!
Just want to say thanks. This was very helpful. That circlip on the left fork was a character-building endeavor. I finally got it out with safety wire and a steak knife
Nice! Love hearing about the "solution"!
Great job Bob
Thanks - no extra parts in the end either! :D
Just FYI- The F850GS Repair manual was updated to state to use Telescopic fork oil (Telescopic fork oil, type 4) rather than the type 2 which it originally had as the type to use as you mentioned in the video, not sure why the change, but thought I'd share that info. Again, really great video, thanks
Thanks for this update info! And glad you enjoyed the video.
hey guys! I agree with @mototravelusa they updated to telescopic fork oil Type 4.... but what does this means in terms of oil weight? What's stands for type 4? 15W? THANKS
Were the progressive springs a good improvement? Or would you rather go for the full cartridge replacement?
I'm thrilled with the spring change-out. It took the "dive" out of the shocks and yet kept a nice supple ride on the highway. If I had infinite dollars, the full cartridge might be nicer, but this was huge bang-for-the-buck as far as I'm concerned.
Hi Bob.
First of all I want to thank you for your videos, they are great and very informative.
I recently bought an f850gs and I am going to install some hyperpro springs with a 40mm height reduction.
Could you please tell me how many millimeters the fork oil level is?
Thank you very much in advance and keep it up.
Greetings from Spain
Hey Jaime - glad this was helpful and good luck with your lowering project. Do be careful as you are changing the geometry of the front end by doing that fyi. As for fork oil levels, I believe all of that is in the video. I don't have access to the specs at the moment so I'd suggest scrubbing through to the point where I'm filling it and you'll catch me talking about specifics.
Not sure if you still check this. Thanks for video, it's great. I got everything done, but when I tried mounting wheel the axle holes are off from each other. Seems I must have the rebuild a different length?? Is this possible or I just plain do it wrong? Thanks
Wow - you mean the effective length of each fork wound up being different, basically? I wonder if this is just a byproduct of the fact that one fork is compression and the other is rebound and you just have to "make it fit" and it's fine. What did you wind up doing as a solution?
Where can I get the work manual? Have been looking for it for some time now without luck. Love your work mate. Thanks
Yeah the manuals are all Windows-based "programs" these days. And they are licensed to the person who bought it too so they've stopped the piracy problem pretty well. Costs about $100 which isn't cheap, but if you do much of your own work... it pays off very quickly.
Bob Wolff thanks
How do you like the progressive springs? I'm thinking of doing the same thing. Thanks for another informative video.
Totally love the progressive springs. I haven't had a chance to get them out in the dirt, but even on the curvy asphalt I've noticed such better response and so much less dive. And yet I don't feel it any stiffer on the highway. The progressive is so cool.
I searched for the oem oil weight for my 2019 f850 gsa and could not locate information. I ended up putting 11.5 weight in but wish I would have used heavier oil to stiffen the front end a little when bmw repaired a leaking seal.
Also wish I would have bought the progressive spring but they did not offer it.
Yeah bummer - well - you can replace the oil at least next go-round and see if it does the trick for ya. But I'd suggest the progressive if you can. :) Super happy with the non-dive now.
I've never rebuilt forks before but I want to maybe do the same with my GS. It seems like next time you put in oil you should maybe only put in 100ml and then "SLOWLY" actuate the valve up and down so for one, the bubbles only have a short distance to travel upwards to the surface and by moving it slowly you won't emulsify the oil and create more bubbles. Let it sit for awhile (work on the other fork) then fill it the rest of the way. And buy yourself a vice man, lol.
Ha - I have a vice. But I don't wanna use it for delicate stuff if I can manage to avoid it. Good luck with your own rebuild. It really wasn't too terrible - took longer than it should, but that's the typical thing at least for me...doing it super carefully the first time.
Is this the touratech hyperpro spring?
No, it is not. I give the spring brand and such in the video. Super happy with it - the progressive part is really noticable for street to workin'-hard / dirt.