Harley-Davidson DYNA FAT BOB Builder Components

Genuine Harley-Davidson

Increased strength rocker supports will handle the increased loads from higher lift cams and higher RPM applications. This product keeps valve train geometry solid. Works with stock or roller rocker arms. Includes required hardware for installation.

Genuine Harley-Davidson

Individual combination front and rear axle wrenches available for your model. 15/16" & 36mm.

Genuine Harley-Davidson

These one-piece tapered pushrods are stiffer than conventional pushrods and are lighter than adjustable pushrods. They are perfectly sized for the engine builder who knows what head and cam combination are being used. Four sizes to fit the most popular head and cam combinations. Sold in sets of 4.

Genuine Harley-Davidson

This massive 58mm bore Throttle Body is extruded, precision machined, and polished to provide all the air you'll need to dominate at the track. Designed for use with Screamin' Eagle Pro cylinder heads. Injectors mount to the Screamin' Eagle Manifold.

Genuine Harley-Davidson

When high-performance engine modifications are made, the increased torque is transferred via the crankshaft to the drive system, putting a significantly higher load on the bearing. The Lefty Bearing is case-hardened on the inner and outer race to provide increased load capacity and enhanced durability in high-torque applications. The bearing is installed in the left side of the crankcase, and supports the output shaft to the primary drive system.

Genuine Harley-Davidson

These pushrods have been designed to allow for easier installation, adjustment, and improved durability. The unique Screamin' Eagle design allows for installation of camshafts in the Twin Cam without the removal of the heads or rocker boxes. The design is also a great performer, constructed of stiff chrome moly tubing and thread-rolled adjusters. Installation retains the Original Equipment chrome short center tube for a high contrast look. Kit includes gloss black pushrod tubes and clips for adjustment of pushrods.

Genuine Harley-Davidson

Born from racing, the Screamin' Eagle Racing - King 6 is a battle-tested performance transmission developed by the Harley-Davidson Factory Race Team competing in the Mission King of the Baggers series. Engineered for enhanced gear engagement and durability. Key features include modified back-cut angles on the shift dogs to improve gear engagement, and super premium heat treat and shot peening on gears and shafts to ensure race-tough strength and durability. You'll enjoy the smooth shifting performance and know this transmission is built with extreme performance in mind. Bolt-in installation. Super premium heat treated and shot peened gears ensure race-tough strength and durability. Torque capacity increased by +25% over the Original Equipment transmission. Smooth gear engagement for quicker shifts. Back cut gears and shift lug/pockets undercut for improved engagement and reduced friction. Upgraded bearings. Screamin' Eagle branding on bearing door. Requires Gasket Installation Kit (P/N 36300043), which includes gaskets, O-rings, main drive seal and bearing, and inner primary bearing race (sold separately).

Genuine Harley-Davidson

These one-piece tapered pushrods are stiffer than conventional pushrods and are lighter than adjustable pushrods. They are perfectly sized for the engine builder who knows what head and cam combination are being used. Four sizes to fit the most popular head and cam combinations. Sold in sets of 4.

Genuine Harley-Davidson

Turn your Original Equipment 110 cubic inch model into a track-ready 117 cubic inch hauler without removing the engine from the chassis. This kit features exclusive bolt-on 4.125" bore cylinders that are engineered with high strength steel liners that slip into the existing factory 110CI Twin Cam crankcase openings. System-matched pistons combine with the Original Equipment CVO cylinder heads to produce a strong 9.9:1 compression ratio. Installation does not require case machining or modification. Kit includes Screamin' Eagle 4.125" Bolt-On Cylinders.

Genuine Harley-Davidson

Convert a 2003-later Twin Cam model with a factory-installed roller bearing to a Timken tapered bearing. Used with Screamin' Eagle Timken Bearing Tool P/N 34823-08.

Genuine Harley-Davidson

Now, racers can take their model's Original Equipment 110 cubic inch motor to a full 117 cubic inches without removing the engine from the chassis. The Screamin' Eagle team has engineered a 4.125" Big Bore Cylinder and Piston package that increase the internal bore from 4.0" to 4.125", without increasing the outside diameter of the cylinder spigot. The cylinder slips into the existing case bore without modification. Have you already installed a CVO Stage III performance kit on your CVO 110 Twin Cam motor? If so, you can retain that performance investment and combine those components with this kit. This kit will add a whopping 7 cubic inches of displacement for more torque throughout the RPM range. The kit includes front and rear cylinders, system-matched pistons with rings, and cylinder head gaskets. All EFI models require ECM calibration (priced separately). For race application only.

Genuine Harley-Davidson

Automatic Compression Release

Genuine Harley-Davidson

These premium pushrods are tapered for enhanced clearance at the cylinder head, allowing the use of higher lift cams. The one-piece chrome moly tube adds rigidity and durability, and the threaded adjustment feature provides easy cam installation without removing the cylinder heads or rocker boxes. To simplify adjustment, the tube features six flats, with one flat marked with a large dot for tracking the adjustment. The threaded rod features 4 flats to reduce wrench swing. Each pushrod features the Screamin' Eagle logo and is marked for "Intake" or "Exhaust". Kit includes 4 pushrods and required pushrod tubes.

Genuine Harley-Davidson

The biggest engines deserve the most fuel. This huge 58mm Throttle Body (8mm or 16% larger than stock) won't leave your engine starving for more air. The one-piece throttle body features Electronic Throttle Control technology.

Genuine Harley-Davidson

Turn your Original Equipment 110 cubic inch model into a track-ready 117 cubic inch hauler without removing the engine from the chassis. This kit features exclusive bolt-on 4.125" bore cylinders that are engineered with high strength steel liners that slip into the existing factory 110CI Twin Cam crankcase openings. System-matched pistons combine with the Original Equipment CVO cylinder heads to produce a strong 9.9:1 compression ratio. Installation does not require case machining or modification. Kit includes Screamin' Eagle 4.125" Bolt-On Cylinders.

Genuine Harley-Davidson

This track-ready 120 cubic inch Screamin' Eagle Crate Motor is waiting to provide a racing enthusiast the opportunity to go racing at an affordable price. This engine is designed for bolt-in installation in the Original Equipment-style chassis of your track bike. The crankcase, cylinders and heads are painted black, and feature machined aluminum highlights and chrome covers for a stunning "show-and-go" look. When equipped with an appropriate high-flow carburetor or throttle body and injectors, an open air induction, and tuned exhaust, this engine is capable of producing a reliable 135+ horsepower at the rear wheel. Engines include a Manufacturer's Statement of Origin (MSO - domestic only). These race-use engines feature only the finest Screamin' Eagle components: 4.060" big-bore cylinders; 4-5/8" stroke SE Pro Stroker Flywheel and Rod Assembly; 10.5:1 high-compression nickel-plated forged pistons with Teflon coated skirts; Titanium SST piston rings; SE-266E high-lift cams; Perfect Fit push rods +.030; SE high-performance lifters; CNC-ported MVA heads with automatic compression release (19206-12 and 19220-12 only); machined lower rocker boxes for valve spring collar clearance; factory-machined engine cases; unique piston oilers for stroker clearances; Screamin' Eagle performance inner cam bearings; Lefty high-performance crankcase output bearing; SE Performance Spark Plugs; 120R cam cover and head medallions; High Volume Oil Pump; and Billet Cam Plate.

Genuine Harley-Davidson

A cost-effective alternative for upgrading the performance of your bike. The intake and exhaust ports are meticulously machined to smooth the surfaces, enhancing the flow characteristics of air and fuel to provide enhanced performance. But it doesn't stop there: oversized (1.875") stainless steel intake valves and stock (1.575") stainless steel exhaust valves rest in reshaped valve seats that improve flow rates. The combustion chambers have been machined to smooth the surface, and feature a blended radius on the bathtub's edge to reduce detonation by eliminating hot spots and promoting improved combustion. The head gasket surface has been milled to maintain stock combustion chamber volume, which results in stock compression when used with Original Equipment pistons. Compression can be increased with the installation of matched Screamin' Eagle high compression pistons. Heads are assembled with high performance valve springs that support cams with lift up to.585".

Genuine Harley-Davidson

Now, racers can take their model's Original Equipment 110 cubic inch motor to a full 117 cubic inches without removing the engine from the chassis. The Screamin' Eagle team has engineered a 4.125" Big Bore Cylinder and Piston package that increase the internal bore from 4.0" to 4.125", without increasing the outside diameter of the cylinder spigot. The cylinder slips into the existing case bore without modification. Have you already installed a CVO Stage III performance kit on your CVO 110 Twin Cam motor? If so, you can retain that performance investment and combine those components with this kit. This kit will add a whopping 7 cubic inches of displacement for more torque throughout the RPM range. The kit includes front and rear cylinders, system-matched pistons with rings, and cylinder head gaskets. All EFI models require ECM calibration (priced separately). For race application only.