Keith Black flat top piston set is .005 oversize with an 8.6:1 compression ratio for 1984-up Big Twin Evolution models.
The Keith Black 390 hypereutectic alloy is cast in a permanent steel mold which makes it possible to build a light weight piston that makes more power and uses less fuel and lasts longer. Pistons are .005 over sized for a 3.498 bore and has a 8.5:1 compression ratio. The low heat transfer of the alloy keeps the skirts cool so piston expansion is minimal. The combination of a low heat transfer piston alloy and high compression ring placement increases power and economy. The high ring placement alone reduces detonation and increases the top ring teperature. **Note:Run engine at moderate speeds for at least 500 miles avoiding excessive running in lower gears in order to properly break-in new pistons and rings.
Fits:
FLST 1986-1998
FLT 1984-1998
FXD 1991-1998
FXR 1984-1994
FXST 1984-1998
UOM: SET
Country Of Origin: USA
Accessory Items:
16-0622 – Ring-O-Matic Ring Compressor Tool Kit
60-0167 – Cylinder Boring Service
16-0075 – Wrist Pin Ring Tool
Fast Shipping and Professional Packing
We offer a broad range of shipping options due to our long-standing relationships with UPS, FedEx and DHL. Our warehouse personnel are highly skilled and will pack your goods in accordance to our exact and precise specifications. Prior to shipping, your goods are carefully examined and safely secured. Each day, we ship to thousands of clients in many countries. This shows our commitment to be the largest online retailer on the planet. Warehouses and distribution centers are found in Europe as well as the USA.
Note: Orders that contain more than one item will be assigned a different processing period for each item.
Before shipping, all ordered items will be thoroughly examined. Most orders are now shipped within 48 hours. The time to deliver varies from 3-7 days.
Returns
We don't manage the stock at our factory and warehouse. Actual stock levels may fluctuate at any time. Be aware that your order is out of stock once the order has been placed.
Our policy lasts for thirty days. If it's been more 30 days since you've purchased your item, we unfortunately can't give you a full exchange or refund.
You are able to return a product in the event that it is not used and in the same condition the day you received it. The item must be in the original packaging.
Related products
