No damage to bore. A quick hone is recommended before install.

Includes cylinder. Piston, pin, dowels and circlips.

Does NOT include any gaskets or anything else not pictured here.

Has about 100 hours on it. Prior owner states piston is relatively new. Everything has a coat of oil on it to prevent oxidation.

These kits are difficult to find.

Compare to MSRP of $1,100.

From Redmoto’s website:

Achieve manageable power from your 2017-2023 CRF 450 with the woods and motocross friendly 400 Engine Bore Kit from RedMoto.

Tested by factory race teams internationally with race winning performance in the most extreme conditions.

World renowned Italian cylinder and piston manufacturer, Athena. The CRF 400 shares the same technical characteristics of its bigger brother, the CRF 450. It is aimed at the rider who demands power without the brute force of the 450. That doesn’t make the CRF 400 any slower. In fact, it is the bike of choice for professional racers in the most prestigious events around the world.

The RedMoto CRF 400 R/RX engine kit swaps the original top end (piston, cylinder, seals) with one that has 92mm bore to reach a total displacement of 413cc.

Developed specifically for HONDA CRF 450 R/RX 2017-2023

**ECU Remap NOT Required**

2023 Honda CRF450R

Has normal wear from use.

All parts were removed from a running 2023 Honda CRF450R.

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Items come as pictured. The exact item you see in the photographs is the exact same item you are receiving. These parts likely fit many different years/models. Please conduct your own research and compare part numbers to ensure compatibility. If you’re unsure of fitment, message me with your make model and year and I may be able to help point you in the right direction.

All parts were personally removed from a 2023 Honda CRF450R. The bike ran up to disassembly but suffered a cracked right crankcase. Please review photos of all parts closely prior to purchasing to ensure that all the parts you need are included in the purchase.

Please review all posted photos carefully. All relevant items in the photos are include in the purchase unless otherwise specified in the description.

Please feel free to message me with any questions about an item or any requests for additional pictures. I am more than happy to send you more specific pictures upon request.

Please check out the rest of my inventory on my store page. If you find other items that interest you, I can at times lower prices for buyers who buy multiple items- please contact me PRIOR to placing an order if you are interested in this.

Shipping and Returns:

Most orders placed on weekdays by 12:30 pm EST will be shipped on the same day. Exclusions may apply to large items which require more preparation for shipment, such as frames, forks or wheels, which may require extra time to pack and ship.

If you are looking for expedited shipping, or combined shipping, please contact me PRIOR to purchase for the easiest buying experience for the both of us!

Some parts, especially electronics, may be shipped with deliberate paint markings or security stickers placed on them. This is to prevent return fraud. Any items that were shipped with security seals that have been removed or tampered with will not be accepted as honest returns and will be disputed with eBay.

I am not responsible for any damage to the purchased part due to assembly or misuse after purchase.

Returns are subject to a minimum 20% restocking fee to cover packaging, handling, fuel and time.

General disclaimer for wear parts:

You may be buying a suspension, braking or motor component. I always recommend when buying a suspension, motor or brake component to inspect and replace any wear parts if deemed necessary. I can not be certain how long the current internals of suspension/hydraulic components have been installed nor what their lifespan will be.

The same applies to any bearings/seals/gaskets. Inspect and replace if necessary. I can not guarantee the age, quality or longevity of these used wear parts.