The Fuel Moto M8 117" (for 107" Milwaukee Eight 4.375" stroke engines) and 124" (for 114" & 117" Milwaukee Eight 4.5" stroke engines) big bore piston & cylinder Stage III kits were developed to work with a wide range of M8 cams and components. These kits feature FM proprietary 10.85 compression pistons by CP Carillo with valve relieves for up to .600 max lift and .200 TDC lift.
Forged pistons from CP Carillo with 10.85:1 compression ratio. The ring end gap is already set and are simply ready to be installed.
The Fuel Moto M8 Stage III big bore kits include bore/hone & finishing your suppled OEM cylinders. If you were looking for a immediate turnaround we also offer a core exchange program for OEM cylinders, Fuel Moto has finished M8 cylinders on the shelf ready to ship with a reasonable core charge. Cometic MLS head & base gaskets are included.
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 firstname.lastname@example.org or give us a call at 920-423-3309 - we will work together to get you up and running.
The Fuel Moto / AIM variable pressure clutch is the most cost effective and powerful kit available to upgrade your H-D stock clutch to handle the added power of the Fuel Moto big bore kit. Developed by Fuel Moto with a specific weight combination to suit our engine packages this clutch will support 135+ horsepower / torque with the upgraded springs.
The Dynojet Power Vision is a flash based fuel tuning tool which allows your motorcycle to be properly re-tuned for your Fuel Moto big bore kit and other performance modifications. We offer base fuel maps and continued fuel map support for your big bore kit with the Power Vision at no additional cost.
The Jackpot Milwaukee-Eight 2/1/2 and XXX Stainless Steel Head Pipes are designed specifically for the tuning & performance characteristics of the new Harley-Davidson Milwaukee-Eight. Fuel Moto has spent countless hours developing our head pipes and our systems continue to be the highest quality, best performing head pipes on the market!
If you have purchased a Fuel Moto big bore kit and are sending back your cylinder cores for a core refund, returns are accepted within 30 days from the purchase date. If you are sending in your engine components to have service performed or if you have purchased a Fuel Moto big bore kit and are sending back your cylinder cores for a core refund please print, fill out, and include the following form with your return: Engine Component Returns Form.