Engine Rebuild Kit .020 Over
Shipping information
Same-day shipping on orders placed before 11 AM Eastern Time.
Free shipping on orders of $150 and over.
Oils and fluids: an additional $10.99 shipping fee applies to each oil and fluid item.
30-day returns on eligible items
Unused, uninstalled items in original packaging. Special-order items: 20 days, 25% restocking fee.
Compatible Applications
| Brand | Application | Engine Type | Application Notes |
|---|---|---|---|
| Yamaha | 3 Cylinder 40–50HP 1984–2008 | 2-Stroke Outboard | Confirm fitment with your engine serial number |
What is Included
| Qty | Included Part | Part Number |
|---|---|---|
| 3 | Pro Piston Kit .020 | 8720 |
| 3 | Wrist Pin Needle Bearing | WP30 |
| 2 | Crankshaft Ball Bearing | 6305 |
| 1 | Powerhead Gasket Kit | 2144-1 |
This is a .020" oversize kit
The pistons are .020" larger than standard, for a finished bore of 2.658". The cylinders must be bored and honed to match the pistons before assembly. Have your machine shop measure the bores and confirm the oversize you need before ordering.
What This Kit is Used For
This Pro Marine engine rebuild kit supplies the pistons, bearings, and gaskets needed to rebuild the powerhead on Yamaha 3 Cylinder 40–50HP 1984–2008 two-stroke outboards, in a .020" oversize configuration.
Key Features and Benefits
- Engine rebuild kit for Yamaha 3 Cylinder 40–50HP 1984–2008
- Includes 3 Pro .020" oversize pistons
- Includes wrist pin and crankshaft ball bearings
- Includes powerhead gasket kit
Kit Details
- Kit Part Number: 8720K3
- Manufacturer: Pro Marine (Aftermarket)
- Engine Type: 2-stroke, 3-cylinder
- Piston Size: .020" Over
- Finished Bore: 2.658"
- Not Included: Crankcase sealant and needle bearing assembly grease
FAQ
What engines does this kit fit?
This kit fits Yamaha 3 Cylinder 40–50HP 1984–2008 two-stroke outboards. Confirm your model and serial number before ordering.
Do I need to bore my cylinders?
Yes. The pistons are .020" oversize, so the cylinders must be bored and honed to 2.658". Standard and other oversize kits are also available.
Is crankcase sealant included?
No. Crankcase sealant and needle bearing assembly grease are sold separately.
Returns & warranty
Most standard items may be returned within 30 days of purchase if unused, uninstalled, complete, and in original packaging. Request a Return Authorization (RMA) before sending anything back. Shipping costs are non-refundable.
Special-order items may be returned within 20 days, subject to a 25% restocking fee.
Warranty claims follow the manufacturer's warranty policy. Contact us and we'll help with the process.