LAISAYZ250FX 2025 - Mud
Tuned for Circuit Moto Cross de St-Pierre-Bois - adds: hardpack, rocky
Yamaha YZ250FX 2025 - 75 kg, Intermediate, Neutral, Mud - Circuit Moto Cross de St-Pierre-Bois
Set this first
Chassis: Fork height in clamps
- Stock value
- -2 ring
- Recommended
- 0 ring
- Change
- 2 ring more than stock
tube protrusion above top clamp
How to test it: Change Fork height in clamps only, nothing else. Then ride the same section or the same number of laps as before and watch whether exactly the behaviour that bothers you changes. If it gets worse or less settled, put the value back.
- Chassis: Fork height in clamps0 ring2 ring more than stockcomputed
- Tire: Front tire pressure0.95 bar0.05 bar less than stockcomputed
- Tire: Rear tire pressure0.95 bar0.05 bar less than stockcomputed
- Shock: Sag107 mm2 mm more than stockcomputed
- Transmission: Front sprocket13 teethOEM
10 confirmed settings available.
Computed from factory specs and your factors
Last reviewed: no release date - this starting value was computed, not measured.
A starting point to verify on the bike - not a safety guarantee. Change one thing at a time and check on track. How LAISA derives this →
All recommended changes
In order, biggest deviation from the stock value first. Take them one at a time.
- Chassis: Fork height in clamps2 ring more than stock
-2 ring0 ringtube protrusion above top clamp
How to test it
Change Fork height in clamps only, nothing else. Then ride the same section or the same number of laps as before and watch whether exactly the behaviour that bothers you changes. If it gets worse or less settled, put the value back.
- Tire: Front tire pressure0.05 bar less than stock
1 bar0.95 bar
Reason: condition Mud - Circuit Moto Cross de St-Pierre-Bois
How to test it
Change Front tire pressure only, nothing else. Then ride the same section or the same number of laps as before and watch whether exactly the behaviour that bothers you changes. If it gets worse or less settled, put the value back.
- Tire: Rear tire pressure0.05 bar less than stock
1 bar0.95 bar
Reason: condition Mud - Circuit Moto Cross de St-Pierre-Bois
How to test it
Change Rear tire pressure only, nothing else. Then ride the same section or the same number of laps as before and watch whether exactly the behaviour that bothers you changes. If it gets worse or less settled, put the value back.
- Shock: Sag2 mm more than stock
105 mm107 mmloaded, rider in gear
Reason: condition Mud - Circuit Moto Cross de St-Pierre-Bois
How to test it
Change Sag only, nothing else. Then ride the same section or the same number of laps as before and watch whether exactly the behaviour that bothers you changes. If it gets worse or less settled, put the value back.
All technical values
Complete settings, technical data, components, gearing and geometry - including the adjusters that exist on the bike but do not carry a confirmed value yet.
| BrakeNissin Hydraulic Disc Brakes | ||
| ChainOEM Chain | ||
| Chain length | 114 links | OEM |
| ChassisOEM Aluminium Bilateral Beam Frame (250F) | ||
| Fork height in clampstube protrusion above top clamp | 0 ring▲ +2 | computed |
| ClutchOEM Wet Multiplate Clutch | ||
| ECUOEM Engine Management | ||
| ForkKYB SSS 48 mm Coil Fork | ||
| Spring rate | 4.7 N/mm | OEM |
| HandlebarOEM Handlebar | ||
| ShockKYB Piggyback Monoshock | ||
| Sagloaded, rider in gear | 107 mm▲ +2 | computed |
| Static sagwithout load | 35 mm | OEM |
| Spring rate | 54 N/mm | OEM |
| SwingarmOEM Aluminium Swingarm | ||
| TireDunlop Geomax MX33 | ||
| Front tire pressure | 0.95 bar (13.78 psi)▼ -0.05 | computed |
| Rear tire pressure | 0.95 bar (13.78 psi)▼ -0.05 | computed |
| TransmissionOEM Final Drive | ||
| Front sprocket | 13 teeth | OEM |
| Rear sprocket | 51 teeth | OEM |
After the ride
Tested a change? Record what happened. LAISA stores it against this bike and this condition. The recommendation above does not adapt to it automatically yet.
About this baseline
For a 75 kg Intermediate rider with a Neutral style, the Mud baseline for the Yamaha YZ250FX 2025 at Circuit Moto Cross de St-Pierre-Bois shifts 4 of 10 computed settings away from the OEM standard. The biggest shifts: Fork height in clamps 0 ring (+2 vs OEM), Front tire pressure 0.95 bar (-0,05 vs OEM). All values are computed from OEM defaults and your rider and condition factors.
Value provenance: OEM = manufacturer specification · verified = confirmed by an expert · reviewed = editorially reviewed reference · community = confirmed by the community (median of at least three public setups) · computed = automatically derived by the LAISA engine. Automatically extracted and unconfirmed values never appear on public pages.
No public community setups yet for this bike and condition.
Doesn't feel right on track?
Pick the symptom and we'll show the likely setup causes - and whether it is really a technique thing.
Troubleshoot a handling problemMatching protective gear
The right setup is half the job - the other half is protective gear matched to the discipline and conditions.
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Frequently asked questions
What is a good Mud setup for the Yamaha YZ250FX 2025?
For a 75 kg Intermediate rider with a Neutral style, the Mud baseline for the Yamaha YZ250FX 2025 at Circuit Moto Cross de St-Pierre-Bois shifts 4 of 10 computed settings away from the OEM standard. The biggest shifts: Fork height in clamps 0 ring (+2 vs OEM), Front tire pressure 0.95 bar (-0,05 vs OEM).
How much race sag for the Yamaha YZ250FX 2025?
As a starting point, 107 mm of race sag at 75 kg rider weight. Measure with a helper and set it via spring preload.
What tire pressure for the Yamaha YZ250FX 2025 in Mud conditions?
As a starting point: 0.95 bar front, 0.95 bar rear - computed for a 75 kg Intermediate rider. Check cold and adjust in small steps by feel.
What gearing (sprockets) does the Yamaha YZ250FX 2025 run?
As a starting point, 13 teeth front / 51 teeth rear. For more acceleration go larger at the rear (or smaller at the front); for more top speed, the reverse.
Are these values safe to ride?
Baseline values are starting points generated from OEM defaults, rider weight, skill, style and conditions - not safety guarantees. Verify on the bike, adjust step by step and ride within your limits.
Baseline values are starting points generated from OEM defaults, rider weight, skill, style, and condition - or lifted from an expert/verified setup where one exists (see the provenance badge). They are not safety guarantees. Verify on the bike and ride within your limits.