The Fuel Moto M8 124" big bore kit is a complete bolt on engine kit for stock engine cases that makes exceptional horsepower and torque. It includes the absolute highest quality components, all of which have been extensively tested in house both on the dynamometer as well as in real world conditions to deliver top level performance. This kit works on 2017-2019 H-D Milwaukee-Eight 107" (4.375" stroke) air cooled & twin cooled engines and when combined with the appropriate performance modifications offers output in excess of 140+ horsepower. This kit works with stock or aftermarket cylinder heads, it requires larger throttle body, injectors, exhaust system, as well as other components that will support 140+Hp. Proper tuning is also necessary, Dynojet Power Vision & Target Tune is recommended, FM has excellent base maps available!
Custom proprietary forged pistons from CP Carillo 10.75:1, 11.0:1, & 11.5:1 compression ratio. The ring end gap is already set and ready to be installed.
The Fuel Moto M8 124" 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
The camshaft is the workhorse of any big bore kit which is why every single Fuel Moto big bore kit includes your choice of Wood Performance Knight Prowler camshaft. Choose from a wide range of cams and compression ratios. Some cams as noted such as the WM8-408 cam require hi lift valve springs (Additional purchase required, not included with kit).
We all want more power with a big bore kit but would never want to sacrifice reliability. The S&S Precision Lifters are a key component which addresses a common concern with the stock lifters which are simply not designed for the increased performance of a big bore kit. We are also a huge advocate of new parts on new parts so with a brand new Wood Performance camshaft we also install the brand new lifters on each and every build we perform in house.
The Fuel Moto quick install adjustable pushrods are the finest pushrods available. Chromoly design which is engineered for maximum strength and durability these pushrods install right inside of the stock pushrod tube covers.
No one wants to be in the middle of a build and find that they are missing a gasket or o-ring to complete their build. With the Fuel Moto big bore kits all the necessary gaskets, o-rings and inner cam bearing are included. We have already performed in house stress tests to find the best performing parts to ensure your build is reliable for years to come.
You will need an exhaust system, air cleaner, EFI tuner, clutch, and other peripherals to support the appropriate power level of this kit. Larger fuel injectors are also required. 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. These engines also require comprehensive tuning, we will supply the appropriate FM base tune. You will need a OEM service manual and some specialty tools such as a inner cam bearing removal/install tool. 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.
$1599.00 Complete kit
$3099.00* 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)
The Fuel Moto 124" big bore kit exceeds the flow capabilities of the OEM injectors and will require the 5.5G/Sec high-flow injector upgrade kit. These injectors are a direct upgrade for your OEM injectors and are recommended to be installed into the stock throttle body.
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 up to 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 do 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 head pipes are designed specifically for the tuning & performance characteristics of the new Harley-Davidson Milwaukee-Eight engine and our kits. 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! The Jackpot head pipe accepts the factory M8 heat shields for premium fit & finish.
The Fuel Moto M8 Level A and Level B CNC cylinder heads were developed through dyno & extensive flowbench testing to deliver maximum performance on hi-output H-D Milwaukee-Eight engines. The Fuel Moto M8 heads are CNC ported and are best suited to 117" & larger engines developing 130-150 horsepower.
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.
