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BMW F800GS

We see a lot of BMW 800GS's with good reason, they are very popular and very capable motorcycles. There are two basic versions, BMW F800 up to 2012 and 2013 on. The difference is the forks; the early version runs Marzocchi, the late model is WP.
There is a common complaint in bending the top shock bolt. It's caused when the shock goes to a solid height, bottoming. The soloution is not a stiffer spring. You either need the shock setting changed so it suits what you are doing, jumping the bike, or replace the shock with a piggyback or remote reservoir type. A non-reservoir shock will not fix the problem.
 

BMW F800GS Forks

F800 GS Forks 2013 onwards - WP.

BMW switched to WP forks for 2013. While it's a good move as the internals can now be revalved, there are no external adjustments. We can get the stock forks working very well if you can live without adjusters. Stock springs are 0.54kg/mm, good for riders up to 110kg. 

Our most poular mod is revalving the stock WP cartriges and produces great results. Every complaint from "too soft" to "too harsh" is addressed in our comprehensive, dyno verified revalve. Plus seals and springs if required.

 

From Years Up To 2012 - Marzocchi.

The forks are really the bug bear of the BMW F800 motorcycle. The stock forks are very soft. A later version had adjustable rebound but they are unchanged internally, spring rate or dampening. Usually we can disassemble the cartridge and make changes (revalving). Unfortunately this is not the case with the Marzocchi fork as the cartridge tube is steel, peened over at the ends. Even if you destroy the tube to get it apart, what's inside is disappointing and not modifiable.

Stiffer fork springs and heavier grade oil are a good cheap mod. Not a perfect answer but better than stock. Stock springs are 0.48kg/mm, we have rates from 0.44 to 0.85kg/mm. Find the rate you need HERE.

Bitubo BMW Fork Cartridge Kit.

This is a drop in kit including springs. They don't stand up to much off road use. There is an ADVRider thread about them HERE. We can service and modify the Bitubo units to make them more reliable. It seems Bitubo didn't do much durability testing.

Shiver Conversion

We take a set of Marzocchi Shiver MX or offroad forks with compression and rebound adjustment and graft them into the GS fork. We also revalve the cartridges so they are suitable for the GS and use an appropriate spring rate. While this is not a cheap conversion, it's much better than the Bitubo option. It does lack external spring preload adjustment though. The axle feet are machined out so you have compression adjustment at the bottom and rebound at top. 

BMW F800GS Shock

Essentially all models use the same Sachs shock. It can be revalved and resprung. The bigger issue is bending top shock bolts when the shock goes to a solid height, bottoming out. The easiest way to prevent this is by getting the dampening and spring rate of the shock right for the rider, stopping the shock from bottoming in the first place. MSC/Rallymoto/Adventure Moto sell a nice alloy brace, but we have still seen bolts bend with the brace in place. There is just too much unsupported bolt, however if you don't jump the bike, chances are you will never bend a bolt. But people like to load it up with heaps of gear and give it hell and wonder why the bolt bends.

The answer to bending top shock bolts is never allowing the shock to reach a solid height. This is achieved by a combination of valving and spring rates, we can modify the stock shock with excellent results.

Sachs Non-Rebuildable Shock Overhaul

We repair, rebuild and revalve your stock Sachs shock, modifying it into a rebuildable shock unit as we go. It won't have adjustability but you only really need one setting: the one that's best! And we revalve it exactly to suit your riding and your weight. No more bent bolts.

 
 
 
 

 

 Replacement Shock Options   ... Call for Latest Offers

 Yacugar Piggyback Shock Absorber assembly with fixed Reservoir 
46mm Bore 
Featuring Rebound & High and Low Compression Adjustment 
Includes remote Hydraulic Spring Preload Adjuster 

27.14.08.0103.2      $1495.00 

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