Engine Rebuild Kit .020 Over
Shipping information
Same-day shipping on orders placed before 11 AM Eastern Time.
Free shipping on orders of $199 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 |
|---|---|---|---|
| Johnson / Evinrude (OMC) | V6 Big Bore 1993-Up | 2-Stroke Outboard | Finger-ported looper |
What is Included
| Qty | Included Part | Part Number |
|---|---|---|
| 3 | Vertex Piston Kit .020 Port | V4320P |
| 3 | Vertex Piston Kit .020 Starboard | V4320S |
| 6 | Wrist Pin Bearing w/ Washers | WP19-1 |
| 6 | Caged Rod Bearing | 741 |
| 12 | Rod Bolt 5/16" | RB6000 |
| 1 | Upper Main Bearing | 495 |
| 2 | Center / Upper Main Bearing | 050 |
| 1 | Lower Main Ball Bearing | 308 |
| 1 | Powerhead Gasket Kit | 4323-1 |
This is a .020" oversize kit
The pistons are .020" larger than standard, for a finished bore of 3.705". 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 Johnson / Evinrude (OMC) V6 Big Bore 1993-Up two-stroke outboards, in a .020" oversize configuration.
Key Features and Benefits
- Engine rebuild kit for Johnson / Evinrude (OMC) V6 Big Bore 1993-Up
- Includes 6 Vertex .020" oversize pistons (3 port, 3 starboard)
- Includes wrist pin, rod, and main bearings plus new rod bolts
- Includes powerhead gasket kit
Kit Details
- Kit Part Number: 4320K6
- Manufacturer: Pro Marine (Aftermarket)
- Piston Brand: Vertex
- Engine Type: 2-stroke, 6-cylinder
- Piston Size: .020" Over
- Finished Bore: 3.705"
- Not Included: Crankcase sealant and needle bearing assembly grease
FAQ
What engines does this kit fit?
This kit fits Johnson / Evinrude (OMC) V6 Big Bore 1993-Up 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 3.705". Standard and other oversize kits are also available.
Why are there port and starboard pistons?
This engine uses side-specific pistons, so the kit includes 3 of each. Install each piston on its matching cylinder bank.
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.