Engine Rebuild Kit STD
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 |
|---|---|---|---|
| Mercury | 135–175 DFI 2.5L | 2-Stroke Outboard | O-ring head; 3.500" standard bore |
This is a standard-bore kit
The pistons are standard size (3.500"), for cylinders that are still within factory specification. If your cylinders are worn or scored and need to be bored, choose the matching oversize kit instead. Have your machine shop measure the bores before ordering.
What This Kit is Used For
This Pro Marine engine rebuild kit is designed for powerhead rebuilds on Mercury 135–175 DFI 2.5L two-stroke outboards, in a standard-bore configuration. Contact us for the complete contents list before ordering.
Key Features and Benefits
- Engine rebuild kit for Mercury 135–175 DFI 2.5L
- Standard-bore piston configuration
- Standard bore: 3.500"
Kit Details
- Kit Part Number: 9800K6
- Manufacturer: Pro Marine (Aftermarket)
- Engine Type: 2-stroke, 6-cylinder
- Piston Size: Standard
- Bore: 3.500"
- Contents: Contact us for the full parts list
FAQ
What engines does this kit fit?
This kit fits Mercury 135–175 DFI 2.5L two-stroke outboards. Confirm your model and serial number before ordering.
Do I need to bore my cylinders?
No, as long as your cylinders are within factory specification. If they are worn or damaged, they will need to be bored and you will need an oversize kit.
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.