The Fuel Moto M8 129" Outlaw piston & cylinder kits takes your 107" M8 engine to 129", this is the largest displacement available for the 107 Milwaukee-8 engine without engine case boring. Includes choice of special application pistons 11.25:1 or 10.8:1 compression. Pistons were designed for Fuel Moto by CP Carrillo race department with optimized skirt and barrel profile, CNC machined under lightening, and feature Calico premium skirt coating. Kit includes new 4.320" cylinders, and Cometic MLS heads & base gaskets. This kit works on 2017-later Milwaukee-Eight 107" 4.375" stroke engines (air cooled & twin cooled) Touring and Softail.
This bolt on kit is designed for 4.375" stroke crankshaft
Special application, custom CP Carrillo pistons - 4.320" bore, 11.25:1 or 10.8:1 compression ratio (assuming factory 89cc chamber) with optimized skirt and barrel profile, CNC machined under lightening, & Calico premium skirt coating. Includes Total Seal rings, end gap is already set and are ready to be installed.
The Fuel Moto M8 129" Outlaw big bore kit includes new big bore cylinders that do not require case boring. Cylinders feature black finish with silver polished highlights. These cylinders feature hi-strength steel liners which allow for "Drop In" installation. (4.320" bore diameter) without boring the cases on H-D Milwaukee-8 engines with a 4.375" stroke. Manufactured by S&S Cycle in Viola, WI USA. Kit includes Cometic MLS head and base gaskets.
This kit is designed for big horsepower, 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.
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 info@fuelmotousa.com or give us a call at 920-423-3309 - we will work together to get you up and running.
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)
