- New
WISECO Forged Piston for YAMAHA TTR 90 2003-2007
€149.90
Tax Included
The piston moves up and down in the cylinder to turn combustion into motion: this kit replaces it along with its rings, pin and clips.
WISECO offers this piston kit for YAMAHA TTR 90 2003-2007. The piston slides in the cylinder and takes the force of the air-fuel combustion, passing it to the connecting rod and crankshaft.
Why choose a forged piston?
Instead of simply being cast, a forged piston is hot-pressed under very high pressure and then machined: its metal is denser and free of air pockets.
- Stronger when hot: it copes better with high revs, overheating and detonation.
- Lighter for the same strength: less stress on the connecting rod and bearings.
- Good to know: depending on the alloy, it expands a little more and is fitted with more clearance; slight noise when cold is normal.
- Why does it cost more? Forging tools, full machining and surface treatments cost more than simple casting.
Why choose WISECO?
Wiseco has forged its pistons in Mentor (Ohio, USA) since 1941 and controls the whole process, from aluminium bar to the friction-reducing ArmorGlide skirt coating. Its pistons are developed with Team Honda HRC in Supercross (450 class since 2018).
When should you replace the piston on your YAMAHA TTR 90?
Harder starting, loss of power, blue smoke, oil consumption or a knock when cold: these are the signs of a tired top end.
No manufacturer hour figure for this model. Cross-Mania guideline: compression check every 50 h in hard use and every 100 h for leisure.
Specifications and fitting tips
- Material: Aluminium
- Piston compression: Standard
- Oversize Letter: A
- Rings Quantity: Set
- Stroke: 4T
- Manufacturer part number: W4840M04700
Cross-Mania tip: Measure the cylinder bore before ordering: the piston must match your cylinder size. Follow the manufacturer's break-in procedure and replace the top-end gaskets at the same time.
Also needed with this part
- Top-end gasket kit : see the selection
- Spark plug : see the selection
- 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50
- Air filter : see the selection
Compatibility
Check the exact model and year of your bike in the list below before ordering.
Fits:
YAMAHA TTR 90 2007
YAMAHA TTR 90 2006
YAMAHA TTR 90 2005
YAMAHA TTR 90 2004
YAMAHA TTR 90 2003
W4840M04700
2 Items
Specific References
Click on your bike to see all compatible parts.
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The piston moves up and down in the cylinder to turn combustion into motion: this kit replaces it along with its rings, pin and clips.
WISECO Forged Piston for YAMAHA TTR 90 2003-2007
€149.90
Tax Included