Keith Black flat top piston set is .040 oversize with a 8.9:1 compression ratio for 1988-up XL 1200cc 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 .040 oversize for a 3.498 bore and has a 9:1 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 detoantion 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:
XL 1988-2022
UOM: SET
Country Of Origin: MEXICO
Suggested Items: 11-1367 – 80 Shovelhead Piston Ring Set .040
Accessory Items:
16-0622 – Ring-O-Matic Ring Compressor Tool Kit
16-0029 – Connecting Rod Clamping Tool
60-0167 – Cylinder Boring Service
Fast Shipping and Professional Packing
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Note: Orders containing more than one item are assigned a specific processing time based on the individual item.
Before shipping, we will examine the items ordered thoroughly before sending the items. The majority of orders are shipped within 48 hours. The time to deliver varies from 3-7 days.
Returns
The stock is constantly changing and cannot be fully controlled by us due to the involvement of multiple different parties, such as the factory and our warehouse. Actual stock levels may fluctuate at any point. Be aware that your order may be out of stock once your order has been made.
Our policy is valid for 30 days. If 30 days have passed by since your purchase however, we're unable to give you a refund or exchange.
You can only return an item in the event that it is not used and is in the same condition when you received it. The item must be in its original packaging.
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