Engine Rebuild Kit .020 Over
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Compatible Applications
| Brand | Engine | Horsepower | Application Notes |
|---|---|---|---|
| Yamaha | V4 90° 6R5, 2-Stroke | 115–130HP | 1993 & up; 23mm wrist pin |
What is Included
| Qty | Included Part | Part Number |
|---|---|---|
| 2 | ProV Piston Kit, .020 Over, Port | 4620PV |
| 2 | ProV Piston Kit, .020 Over, Starboard | 4620SV |
| 4 | Wrist Pin Bearing, Caged, 23mm | 323 |
| 4 | Rod Bearing, Caged | 836 |
| 8 | Rod Bolt, 90° | RB4000 |
| 1 | Upper Main Bearing | 6038 |
| 1 | Center Main Bearing Kit | 7626 |
| 1 | Lower Main Ball Bearing | 208 |
| 1 | Powerhead Gasket Kit | 2120 |
This is a .020" oversize kit
The pistons are .020" larger than standard, for a finished bore of 3.564". 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 1993 and later Yamaha 115–130HP 90° V4 (6R5) outboards that have been bored .020" oversize.
Key Features and Benefits
- Complete powerhead rebuild kit for Yamaha 115–130HP 90° V4, 1993 & up
- Includes four ProV .020" oversize pistons (two port, two starboard)
- Includes 23mm wrist pin bearings, rod bearings, and main bearings
- Includes new 90° rod bolts and powerhead gasket kit
- One part number covers the full rebuild
Kit Details
- Kit Part Number: 4620K4
- Manufacturer: Pro Marine (Aftermarket)
- Engine Type: 2-stroke, 90° V4 (6R5)
- Piston Size: .020" Over
- Finished Bore: 3.564"
- Wrist Pin Size: 23mm
- Not Included: Crankcase sealant and needle bearing assembly grease
FAQ
What engines does this kit fit?
This kit fits 1993 and later Yamaha 115–130HP 90° V4 outboards with the 6R5 block and 23mm wrist pins.
Why are there port and starboard pistons?
The V4 uses side-specific pistons, so the kit includes two of each. Install each piston on its matching cylinder bank.
Do I need to bore my cylinders?
Yes. The pistons are .020" oversize, so the cylinders must be bored and honed to 3.564".
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