Rear Suspension Upgrades
The rear suspension is adequate for the majority of riders but there are those who are using the machine in
offroad situations who will require some upgrades varying from simple shock replacement to longer travel and
larger rear wheel and wider rim. In addition some riders feel the need to reduce the height of the machine.
The items to watch and information on changes are below. The Dakar and Sertao rear shock is the same.
Rear Suspension Lengths
The difference in height of the rear suspension between the GS and Dakar
is set by different shock absorber
lengths rather than by different length linkages. The shock absorber lengths (in mm) are:
GS 315 - Stroke 47.5, Dakar 326 - Stroke 59.5, Linkage Ratio 3:50
18 inch Rear Wheel
An 18" rear wheel coupled with a 3.25" width rim can widen the tyre choice and raise the rear by 1/2". Clearance
on the fuel tank is minimal and needs to be checked. The chain needs 114 links and the adjusters need additional
The 650X has an 18" rear wheel.
Suspension Linkages and Bearings
The swingarm axle bearings are unsealed and require maintenance or they wear prematurely and can seize.
The axle can be difficult to remove if it is left for too long. The pdf here outlines how to add seals to
prevent the problems without swingarm modification.
Swingarm Bearing Mod
The suspension linkages require maintenance and the bolts are known to bend and in some cases break. At least
some bolts are fully threaded and weaker than they should be. The bolts should be checked and replaced.
The bolts are M10x51, M10x65, M12x110 and worthy spares to carry.
Raising and Lowering Links
Fitting replacement forks without shortening such as the YZ forks it is necessary to raise the rear by 25mm.
The STD linkages are 85mm centre to centre, 25mm rise are 76mm C-C
Contact Aquatic at Advrider for raising links
Kouba make 1" and 2" lowering links for the GS as well as replacement
The front forks can be raised 7/8" easily to maintain geometry. Lowering the GS more than 1" would
not be recommended unless the suspension travel was reduced.
Remote Reservoir Compression Adjustment
Compression adjustment can be added to the Showa rear shock.
This is a brief write up by Dansin over at Advrider.
The shock can also be rebuilt, a write up will be added
The Honda CBR600 FX/FL remote reservoir with compression adjustment can be used in rebuilding the OEM shock.
Rear Shock Absorber Options
Most of the manufacturers have shocks available with choices on adjustability and remote reservoirs