LAISAYZ250FX 2025
Track: Whitby Motocross (Skelder Bank)
← Back to Whitby Motocross (Skelder Bank)Taken over from the track: Hardpack · Jumps · Fast · Off-camber · dry
Yamaha YZ250FX 2025 - 75 kg, Intermediate, Neutral, Whitby Motocross (Skelder Bank)
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: Rear tire pressure1.1 bar0.1 bar more than stockcomputed
- Tire: Front tire pressure1.05 bar0.05 bar more than stockcomputed
- Transmission: Rear sprocket50 teeth1 tooth less than stockcomputed
- Shock: Sag105 mmOEM
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: Rear tire pressure0.1 bar more than stock
1 bar1.1 bar
Reason: condition Whitby Motocross (Skelder Bank)
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.
- Tire: Front tire pressure0.05 bar more than stock
1 bar1.05 bar
Reason: condition Whitby Motocross (Skelder Bank)
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.
- Transmission: Rear sprocket1 tooth less than stock
51 teeth50 teeth
Reason: condition Whitby Motocross (Skelder Bank)
How to test it
Change Rear sprocket 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 | 105 mm | OEM |
| Static sagwithout load | 35 mm | OEM |
| Spring rate | 54 N/mm | OEM |
| SwingarmOEM Aluminium Swingarm | ||
| TireDunlop Geomax MX33 | ||
| Front tire pressure | 1.05 bar (15.23 psi)▲ +0.05 | computed |
| Rear tire pressure | 1.1 bar (15.95 psi)▲ +0.1 | computed |
| TransmissionOEM Final Drive | ||
| Front sprocket | 13 teeth | OEM |
| Rear sprocket | 50 teeth▼ -1 | computed |
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 baseline for the Yamaha YZ250FX 2025 at Whitby Motocross (Skelder Bank) shifts 4 of 10 computed settings away from the OEM standard. The biggest shifts: Fork height in clamps 0 ring (+2 vs OEM), Rear tire pressure 1.1 bar (+0,1 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.
Next steps
Dial in your riding technique
Skills that change how the bike behaves - often the real fix before any clicker.
Explore techniqueMatching protective gear
The right setup is half the job - the other half is protective gear matched to the discipline and conditions.
Gear for these conditionsUpgrades that fit
Optional aftermarket parts for this bike - the setup above comes first, these are next.
Related
Similar bikes
Matching tracks
Frequently asked questions
How much race sag for the Yamaha YZ250FX 2025?
As a starting point, 105 mm of race sag at 75 kg rider weight. Measure with a helper and set it via spring preload.
What tire pressure is recommended for the Yamaha YZ250FX 2025?
As a starting point: 1.05 bar front, 1.1 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 / 50 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.