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Fuel Moto 128" SP Piston & Cylinder kit 10.75 Compression for 114 & 117 Milwaukee-8 engines M8

Availability: Kits are assembled & shipped within 2-3 business days
NOTE: This product has the following shipping restriction(s):
  • This product cannot ship to California.
Pricing: $839.95

Customize Your Item

- Add Fuel Injectors -
NOTE: This product has the following shipping restriction(s):
  • This product cannot ship to California.


Our value priced Fuel Moto SP M8 128" big bore 10.75 compression piston & cylinder kit takes your Harley Davidson 114" or 117" M8 engine to 128" with no engine case boring required, it was developed to work with a wide range of M8 cams and components. This lower compression kit works especially well with shorter lift/duration bolt in cams such as the Wood WM8-22x, 22XE, 22XD, & 222, Redshift RS-468, S&S 475, CR 460 & 480 and other similar grinds. Includes forged piston kit, new cylinders, and Cometic MLS heads & base gaskets. This kit works on 2017-later Milwaukee-Eight 114" & 117" engines (air cooled & twin cooled) Touring and Softail. Works with stock or ported heads. 

The Fuel Moto SP M8 128" 10.75 kit includes the following: 

Custom Fuel Moto / CP Carillo Forged Pistons

Forged pistons 

CP Carrillo Forged pistons 4.250" bore, 10.75:1 compression ratio, manufactured in USA. The ring end gap is already set 


Fuel Moto Precision Bored Cylinders

New cylinders

The Fuel Moto SP 128" 10.75 big bore kit includes new cylinders. Note the cylinders in this kit are globally sourced, quality meets or exceeds the OEM cylinders (click here for our 128 kit that includes USA made cylinders)  Cylinders are black with silver polished highlights. Cometic MLS head & base gaskets are included. 

What else do I need?

You will need an exhaust system, air cleaner, EFI tuner, and clutch spring and/or lockup to support the appropriate power level of this kit. Milwaukee-8 engines also require larger fuel injectors. Fuel Moto engine kits require installation by a qualified mechanic with experience in engine building and the appropriate tools to check all clearances & tolerances during engine assembly following the OEM service manual procedures and any additional instructions provided. You will need a OEM service manual and some specialty tools such as a inner cam bearing removal/install tool. These engine kits also require comprehensive tuning, we will supply the appropriate FM base tune. Check our FM University site for helpful tips and info. 

Unlimited Technical Support From Fuel Moto

You have done all of your research but maybe you still have a question. The technicians at Fuel Moto have the answers and would welcome your call. With every Fuel Moto big bore kit purchase we include unlimited technical support. Shoot us an email at or give us a call at 920-423-3309 - we will work together to get you up and running.


Professional turn key Installation:

available at our location including the complete kit, break in & dyno tune on our state of the art dyno. (*does not include EFI tuning device, exhaust system, throttle body, injectors or other associated parts such as oil & filter)

Application List

Fitment for FMS-M8-128-1075-SP


  • FMS-M8-128-1075-SP
  • FMS-M8-128-1075-SP
  • Fuel Moto
  • Kits are assembled & shipped within 2-3 business days
  • New


Shipping Information

  • Item Requires Shipping
  • 30.0 lbs.
  • W21.0000” x H14.0000” x L14.0000”
  • This item ships in its own box.