Keith Black flat piston set is standard size with a compression ratio of 8.6:1 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 standard size 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 temperature. **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: MEXICO
Suggested Items: 11-1363 – 80 Shovelhead Piston Ring Set Standard
Accessory Items:
16-0622 – Ring-O-Matic Ring Compressor Tool Kit
16-0075 – Wrist Pin Ring Tool
Tech Notes: Use the ring end gap instructions to avoid ring butting.
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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.
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