The RC2 Fox shock absorber has 3 adjustments, 1 Rebound on the bottom (shaft end) of the shock and 2 concentric Compression adjusters on the head of the reservoir.
The shocks are tuned by screwing the adjusters clockwise all the way in and counting clicks out (anti clockwise).
The rebound adjuster effects low speed chassis movement on corner entry (rear shocks) and exit (front shocks) and also the wheels ability to track the ground over high frequency ‘cobble stone’ or Pavé type of surface undulation.
As a rule of thumb it is advisable to only use just enough rebound to get the job done.
Excessive (too slow) rebound adjustment compromises traction due to not allowing the wheel to follow the undulations in the ground.
We would suggest tuning this adjuster first, staring 18 – 20 clicks out (from full clockwise) and adjusting in 3 clicks at a time until the driver is happy with the stability of the axle the shocks are fitted to and traction is not too compromised.
The compression adjuster housing is split into two distinct circuits:-
The main high speed circuit is adjusted with a 17mm or (18mm in early RC2s) spanner.
This adjuster controls the high speed flow of oil into the reservoir.
Its function is twofold, primarily it is used to stop bottom out on rough tracks and should be increased as track conditions deteriorate - secondly it has some effect on traction, mainly in high speed/high grip, dry conditions when the vehicles corner exit speed is high and/or the corners are quite rough.
Increasing the high speed adjuster will increase grip in some high shaft speed situations, if this is detrimental, the low speed adjuster can be softened to reset the overall balance.
We would suggest starting with this adjusted to 12 clicks out and adjust from there.
The low speed circuit is a small bore needle valve type bleed adjuster that bypasses the high speed circuit. It is adjusted by a flat blade screw driver.
Its function is primarily to control tyre load at low shaft speeds (normally start line and corner exit).
This adjuster is the primary control for traction as track conditions change; in dry high grip conditions, it should be screwed in for more traction and in wet weather and low grip, screwed out.
On polished, 'blue groove' dirt tracks it is sometimes necessary to screw the low speed out (soften) while screwing the high speed in (stiffen), this will result in more initial body movement (due to softer low speed damping) and resulting high tyre loads once vehicle begins to accelerate (higher high speed damping).
We would suggest starting with this adjuster 3 clicks out from full clockwise and adjust to suit conditions.
Please be aware that the low speed adjuster will be at its most sensitive when adjusted close to maximum (fully screwed in).