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Fuel Moto M8 124" Piston & Cylinder Big Bore kit 10.75:1 107 engines

NOTE: This product has the following shipping restriction(s):
  • This product cannot ship to California.
Pricing: $999.95

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


The Fuel Moto M8 124" big bore 10.75 compression piston & cylinder Builder Kit takes your 107" M8 engine to 124" 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 & 222, Redshift RS-468, S&S 475, CR 460 & 480 and other similar grinds. Includes premium CP-Carrillo custom piston kit, new Extreme Duty cylinders, and Cometic MLS heads & base gaskets. This kit works on 2017-later Milwaukee-Eight 107" engines (air cooled & twin cooled) Touring and Softail. Works with stock or ported heads. 

The Fuel Moto M8 124" 10.75 kit includes the following: 

Custom Fuel Moto / CP Carillo Forged Pistons

CP Carrillo custom pistons 

proprietary FM custom CP Carrillo pistons 10.75:1 compression ratio, premium X-forging with fully developed skirt profile. The ring end gap is already set and are simply ready to be installed.


Fuel Moto Precision Bored Cylinders

New Extreme Duty cylinders

The Fuel Moto M8 124" 10.75 big bore kit includes new Extreme Duty cylinders with high strength ductile iron sleeves, bore/hone finish work is done on OEM level machinery to exact tolerances. Cylinders are black with silver polished highlights. manufactured by S&S Cycle in Viola, WI USA. 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.

Retail Price:

$999.95 Piston kit, new cylinders, head & base gaskets.

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 Fuel Moto M8 124" Big Bore Kit


  • FMS-M8-124-1075-KIT
  • FMS-M8-124-1075-KIT
  • Fuel Moto
  • New


Shipping Information

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