4982M08300 Wiseco +6 mm Piston Kit for Yamaha YZ250F 2001-2011 83.00 mm 13:1 CR
4982M08300 Wiseco +6 mm Piston Kit for Yamaha YZ250F 2001-2011 83.00 mm 13:1 CR
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+6 mm Piston Kit for Yamaha YZ250F
This Wiseco +6 mm piston kit for Yamaha YZ250F delivers an 83.00mm forged piston with a 13:1 compression ratio, cross-referenced under part number 4982M08300.
Overview
This +6 mm piston kit for Yamaha YZ250F increases displacement for 2001-2011 four-stroke motocross engines. The 83.00mm forged piston runs a 13:1 compression ratio for added torque and stronger pull out of corners. Engine builders choose this big bore piston kit for Yamaha YZ250F projects that need more displacement without sacrificing reliability.
Built For Performance
- Forged aluminum construction for strength under increased cylinder pressure
- 83.00mm oversize bore for a +6 mm displacement gain
- 13:1 compression ratio suited to big bore builds
- Kit includes piston, rings, wrist pin, and circlips
- Cross-reference 4982M08300 for verified application matching
- Precision machined for consistent ring seal and bore fit
Fits These Machines
- for Yamaha YZ250F 2001
- for Yamaha YZ250F 2002
- for Yamaha YZ250F 2003
- for Yamaha YZ250F 2004
- for Yamaha YZ250F 2005
- for Yamaha YZ250F 2006
- for Yamaha YZ250F 2007
- for Yamaha YZ250F 2008
- for Yamaha YZ250F 2009
- for Yamaha YZ250F 2010
- for Yamaha YZ250F 2011
On-The-Job Use
- Big bore top-end builds for added displacement
- Race engine assembly where class rules allow overbores
- Rebuilding high-hour YZ250F engines with cylinder work
- Restoring and increasing compression during a full top-end service
Specs At A Glance
| Part Number(s) | 4982M08300 |
| Bore Size | 83.00mm (+6 mm) |
| Compression Ratio | 13:1 |
| Piston Type | Forged |
| Fitment Years | 2001-2011 |
Good To Know
Q: Does this kit require cylinder machining? A: Yes, a +6 mm oversize piston needs the cylinder bored and replated to match the 83.00mm bore. Have a qualified machine shop set piston-to-cylinder clearance before assembly.
Q: Does the kit include rings and pin? A: Yes, this piston kit ships with the piston, rings, wrist pin, and circlips. Verify ring end gap and clearance during assembly.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.
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