I'm Boris Galuzin and It's GPR V4 rebuild
Manufacturers recommend change the oil in the stabilizer every two years
In case of leakage, it is necessary to repair it
For GPR V4 rebuild you will need: new o-rings, fork oil 5-10w, syringe, stop clip,
kerosene and brush
Non european inch screwdrivers are used
First remove the stop clip to pull the adjusting stem
As you can see, the adjustment of the damper is carried by deepening furrow
Next, remove the top cover and drain the oil
Oil is dirty, it indicates that it wasn't changed for a long time
To remove the inner cylinder unscrew the lever
Old o-rings are removed
It is convenient to use a needle or a paper clip
When removing the o-rings it's important not to damage the anodized parts
Bolts of drain holes also have small o-rings
Old o-rings and stop clip should be changed for new ones
After disassembling, all parts should be thoroughly washed in kerosene and dry
Assemble in reverse order
O-rings of moving parts should be lubricated
It's easy to fill oil with syringe
Manufacturer recommends fork oil 5-10w depending on individual preferences
Before pouring the oil, rotate the lever down and tilt the stabilizer to one hole is higher than the other
Pour oil in the bottom hole until it comes out from the top
Next, you should close the holes and pull the lever to determine the air in the system
You can feel the air in the extreme positions of the lever
If there is an air - add some oil - turn the lever to the center position and tilt stabilizer to rise the air to the input hole
A small amount of air in the system is allowed for thermal expansion
At the end wipe stabilizer dry
It was GPR V4 rebuild, subscribe if information was useful!