Tech list the fork oil levels rather than quantities for these Tech Suspension forks as it is impossible to get all the old oil out of the forks without fully dismantling the forks and the damper.
Right Hand Leg (Damper Side)
Tech Suspension specify an air gap (see table below) from the top of the oil to the top of the fork stanchion for the right hand fork leg, the one with the damper in it, this is with the forks bottomed out and the damper as far down as it will go, to do it properly you need to undo the top cap off the damping rod so the damping rod can be pushed all the way down.
Use a 14mm and a 17mm open ended spanners to undo the lock nut and remove the cap piece from the damper rod, this allows better access to check the require oil height. Be careful not to lose the small aluminium piece from the top of the damper rod!
| FORK CODE | MOTORCYCLE MAKE | YEAR | OIL LEVEL | OIL TYPE |
|---|---|---|---|---|
| 151239051 | Sherco | 2011-12-13-14-15-16 | 55 | OJ 01 |
| 151239054 | Sherco Factory (aluminium) | 2014-15-16 | 75 | OJ 01 |
| 151239111 | GasGas | 2012 | 55 | OJ 01 |
| 151239031 | Beta | 2011-12-13-14 | 55 | OJ 01 |
| 151239101 | Jotagas | 2012 | 55 | OJ 01 |
| 151239113 | Jotagas JGas (aluminium) | 2014 | 75 | OJ 01 |
| 151239113 | GasGas Raga Factory (aluminium) | 2013-14 | 75 | OJ 01 |
| 151239113 | Ossa (aluminium) | 2014 | 75 | OJ 01 |
| 151239121 | Montesa Honda 4RT (standard) | 2014-15-16 | 50 | OJ 01 |
To do a quick check and save you taking the top cap off the damper rod you can use a thin rule and put it down the side of the top cap, then push the top cap down to the top of the forks you should then have around a 58mm air gap from the top of the oil to the top of the fork stanchion (this is for the Sherco with the steel stanchions only).
Left Hand Leg (Spring Side)
Tech specify an air gap (see table below) from the top of the oil to the top of the fork stanchion for the left hand fork leg, the one with the spring in it, this is with the forks bottomed out and the spring removed from the fork leg.
| Fork Code | Motorcycle Make | Year | Oil Level | Oil Type |
|---|---|---|---|---|
| 151239051 | Sherco | 2011-12-13-14-15-16 | 110 | OJ 01 |
| 151239054 | Sherco Factory (aluminium) | 2014-15-16 | 130 | OJ 01 |
| 151239111 | GasGas | 2012 | 110 | OJ 01 |
| 151239031 | Beta | 2011-12-13-14 | 110 | OJ 01 |
| 151239101 | Jotagas | 2012 | 110 | OJ 01 |
| 151239113 | Jotagas JGas (aluminium) | 2014 | 130 | OJ 01 |
| 151239113 | GasGas Raga Factory (aluminium) | 2013-14 | 130 | OJ 01 |
| 151239113 | Ossa (aluminium) | 2014 | 130 | OJ 01 |
| 151239121 | Montesa Honda 4RT (standard) | 2014-15-16 | 100 | OJ 01 |
Oil type
Tech recommend OJ Racing Fork oil Type 01 which has the following specs:
Viscosity at 40º C –> 15.06 mm2/s (cSt)
Viscosity at 100ºC –> 3.472 mm2/s (cSt)
Index of viscosity (VI) –> 106
The closest oil we have to these specs is the Ipone Fork Fluid 3W, you will easily have enough oil to do both fork legs with a litre bottle.
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