Big Bore Kits
Zippers PerformanceZipper's M8 124" Cylinder Kit, -5.5cc Dished Pistons
✓ Verified fit for your 2020 Road King 107
⚠ Fits with conditions: Designed for stock heads - the piston dome volume determines which. Zipper's states the head requirement per kit, so choosing the wrong dome for the rider's heads changes compression.
⚠ Race/closed-course product. Ensuring legal use for your jurisdiction and intended riding is the customer's responsibility.
About this part
Zipper's 4.250" bore big-bore cylinder kit taking a 107" M8 to 124". -5.5cc dished forged CP pistons, designed for stock heads. Includes precision-fitted cylinders, 2618 forged pistons with ring packs, pins and clips, Cometic .014" base and .030" head gaskets and new head bolts. Fits the factory engine base without case boring.
Options that fit your bike
- 5.5cc dished$1,529.00
⚠ Race/closed-course product. Ensuring legal use for your jurisdiction and intended riding is the customer's responsibility.