- New
PROX Timing Chain for YAMAHA WRF 250, YZF 250 and FANTIC XXF 250 2024-2026
€83.90
Tax Included
PROX timing chain for YAMAHA WRF 250, YZF 250 and FANTIC XXF 250 from 2024 to 2026.
The PROX 31.2424 timing chain is designed for YAMAHA WRF 250, YZF 250 and FANTIC XXF 250 from 2024 to 2026. The timing chain drives the camshafts from the crankshaft and keeps the valves in sync with the piston. As it stretches, it throws the valve timing out and pushes the tensioner to the end of its travel.
Specifications
- Brand: PROX
- Manufacturer part number: 31.2424
- Weight: 200 g
- Engine: 4-stroke
When to replace it?
- Rattling or chain noise on the timing side, especially at idle.
- Tensioner at the end of its travel.
- Timing marks that no longer line up.
At the intervals in the service manual, and as soon as the tensioner reaches the end of its travel. Check the sprockets and the guides at the same time.
Fitting tips
- Set the engine at top dead centre on the compression stroke, marks aligned, before removing anything.
- On most motocross engines the chain is endless, with no master link: replacing it means removing the crankshaft sprocket or a camshaft, as described in the manual.
- Line the camshafts up with their timing marks again, then put the tensioner back under tension.
- Turn the engine over two full turns by hand and check the timing again before starting.
- Refit with a valve cover gasket in good condition.
Why PROX?
Founded in 1975 and based near Amsterdam, ProX specialises in engine and clutch wear parts for off-road bikes. The brand has most of its range made in Japan, by OEM suppliers, for quality on a par with the original parts.
Spare parts and items to plan
- Cam chain tensioner : GE.CO
- Valve cover gasket : MOOSE 817852MSE · MOOSE 819030MSE
- Valve shims : HOT CAMS HCSHIM01 · HOT CAMS 5PK748
- 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50
Frequently asked questions
Should I replace the tensioner?
Check it: a worn tensioner, or one at the end of its travel, must be replaced along with the chain.
Compatibility
Check the exact model and year of your bike in the list below before ordering.
Fits:
FANTIC XXF 250 2026
FANTIC XXF 250 2025
FANTIC XXF 250 2024
YAMAHA WRF 250 2026
YAMAHA WRF 250 2025
YAMAHA YZF 250 2026
YAMAHA YZF 250 2025
YAMAHA YZF 250 2024
31.2424
5 Items
Specific References
Click on your bike to see all compatible parts.
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PROX timing chain for YAMAHA WRF 250, YZF 250 and FANTIC XXF 250 from 2024 to 2026.
PROX Timing Chain for YAMAHA WRF 250, YZF 250 and FANTIC XXF 250 2024-2026
€83.90
Tax Included