SPECIAL PURCHASE Fuel Moto 128" Big Bore Piston & Cylinder Kit BLACK M8 114 117 Engines

Custom CP Carrillo Pistons

CP Carrillo pistons - 4.250" bore, choice of 11.5:1, 11.0:1, or 10.75:1 compression ratio (assuming factory 89cc chamber) with optimized skirt and barrel profile, ring end gap is already set and are ready to be installed.

New bolt on, big bore cylinders

The Fuel Moto M8 128" big bore kit includes new big bore cylinders that do not require case boring. Cylinders feature black finish. (4.250" bore diameter) for H-D Milwaukee-8 engines with a 4.5" stroke. Manufactured by S&S Cycle in Viola, WI USA. Kit includes Cometic MLS head and base gaskets. 

What else do I need?

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.