Motorcycle Dirt Bike ATV Snowmobile Brands

My Account Support

Free Shipping.

Expert Service.

Motorcycle Menu

Motorcycle Categories

Batteries
Bodywork
Brakes
Cables & Lines
Clutches
Dress & Trim
Drivetrain
Electrical
Engine Parts
Exhaust
Foot Controls
Fuel Systems
Gaskets & Seals
Hand Controls
Ignition
Intake & Air
Lights
Luggage
Oil & Filters
Seats
Suspension
Tools & Garage Supplies
Wheels & Tires
View All

Shop By Vehicle

2004 Harley Davidson FLSTFI Softail Fat Boy
Select Vehicle

Featured Brands

All Balls
BikeMaster
Drag Specialties
EBC
Emgo
HardDrive
Kuryakyn
Magnum
Moose Racing
Motion Pro
Parts Unlimited
Puig
Saddlemen
Vortex Racing
View All

Free Shipping on all orders.

No minimum required.

Dirt Bike Menu

Dirt Bike Categories

Batteries
Bodywork
Brakes
Cables & Lines
Clutches
Drivetrain
Electrical
Engine Parts
Exhaust
Foot Controls
Fuel Systems
Gaskets & Seals
Guards & Armor
Hand Controls
Ignition
Intake & Air
Lights
Oil & Filters
Seats
Suspension
Swingarm & Frame
Tools & Garage Supplies
Wheels & Tires
View All

Shop By Vehicle

Select Vehicle

Featured Brands

Acerbis
All Balls
BikeMaster
EBC
Factory Effex
Fire Power
Moose Racing
Motion Pro
Namura
Polisport
PRO-X
UFO Plastics
Vertex Pistons
Wiseco Piston
View All

Free Shipping on all orders.

No minimum required.

ATV Menu

ATV Categories

Batteries
Bodywork
Brakes
Bumpers & Racks
Cables & Lines
Clutches
Drivetrain
Electrical
Engine Parts
Exhaust
Fuel Systems
Gaskets & Seals
Guards & Armor
Hand Controls
Ignition
Intake & Air
Lights
Oil & Filters
Seats
Suspension
Tools & Garage Supplies
Towing & Transportation
Wheels & Tires
View All

Shop By Vehicle

Select Vehicle

Featured Brands

All Balls
BikeMaster
Bronco ATV
EBC
EPI
Mikuni
Moose Racing
Motion Pro
Namura
Parts Unlimited
PRO-X
Quadboss
Vertex Pistons
Wiseco Piston
View All

Free Shipping on all orders.

No minimum required.

Snowmobile Menu

Snowmobile Categories

Batteries
Bodywork
Brakes
Bumpers & Racks
Cables & Lines
Clutches
Drivetrain
Electrical
Engine Parts
Exhaust
Fuel Systems
Gaskets & Seals
Hand Controls
Ignition
Intake & Air
Lights
Luggage
Oil & Filters
Skis & Runners
Suspension
Tools & Garage Supplies
Towing & Transportation
Tracks & Tunnels
View All

Shop By Vehicle

Select Vehicle

Featured Brands

Goodridge
Helix Racing
Kimpex
Mikuni
Namz
Parts Unlimited
Performance Tool
Sno Stuff
SP1
Sport Parts Inc
Stud Boy
Vertex Pistons
Wiseco Piston
Woody's
View All

Free Shipping on all orders.

No minimum required.

Brands Menu

Featured Brands

Acerbis
Drag Specialties
EBC
Emgo
Fire Power
FMF Racing
HardDrive
Jims USA
K&S Technologies
Kuryakyn
Lindby
Moose Racing
Motion Pro
Progressive Suspension
ProTaper
Rick's Motorsports
Roland Sands Design
S&S Cycle
Sunstar Sprockets
UFO Plastics
Vance & Hines
Vesrah
Yoshimura
View All

Shop By Vehicle

2004 Harley Davidson FLSTFI Softail Fat Boy
Select Vehicle

All Brands

A – C
D – G
H – M
N – R
S – Z

Free Shipping on all orders.

No minimum required.

Brands
KB Performance
Engine Parts
Pistons & Rings
Pistons

KB Performance Pistons

Fits: 2004 Harley Davidson FLSTFI Softail Fat Boy

Sort:

page 1

2 Results

KB Hypereutectic Cast Pistons

$114.82 – $272.79

5.0 of 5 stars (1)

Exact Fit
KB Forged Pistons

$285.63 – $285.65

5.0 of 5 stars (6)

Exact Fit

page 1

Compression Ratio

10.5:1 8.8:1 9.25:1 9.3:1

Size Over Standard

0.005 in. Larger than Stock 0.010 in. Larger than Stock 0.020 in. Larger than Stock 0.030 in. Larger than Stock Stock

Prices

$100 – $250 $250 – $500

Website Footer

Parts Specialists

Need help? Get advice you can trust and outstanding service.

Fitment Guaranteed

We guarantee our products will fit your vehicle or your money back.

Free Shipping

Fast and free shipping to your door on all orders.

Easy Returns

No restocking fees & quick refunds.

General Information

Help Center
Contact Us
About Us

Shipping & Ordering

Ordering Help
Shipment Questions
Return Policy

Secure Shopping

Payments & Billing
Privacy Protection
Security

Customer Satisfaction Guarantee

PartsGiant.com is the powersports specialist. If you have questions or problems, just email us and our expert customer support staff will do everything possible to help.

Copyright © 2025 Parts Giant. All Rights Reserved. Web site constitutes acceptance of the Parts Giant User Agreement and Privacy Policy.

My Garage

Past Selections:

Filter By Vehicle:

Website Menu

Welcome, Sign In

Main Menu
Motorcycle Parts
Dirt Bike Parts
ATV Parts
Snowmobile Parts
Brands

Shop By Vehicle
2004 Harley Davidson FLSTFI Softail Fat Boy
Select Vehicle

Your Account
Help Center
Contact Us
About Us

Motorcycle Parts view all

Dirt Bike Parts view all

Batteries
Bodywork
Brakes
Bumpers & Racks
Cables & Lines
Clutches
Dress & Trim
Drivetrain
Electrical
Engine Parts
Exhaust
Foot Controls
Fuel Systems
Gaskets & Seals
Gauges
Guards & Armor
Hand Controls
Ignition
Intake & Air
Lights
Luggage
Manuals
Oil & Filters
Seats
Security & Alarms
Suspension
Swingarm & Frame
Tools & Garage Supplies
Towing & Transportation
Wheels & Tires

ATV Parts view all

Snowmobile Parts view all

Filter By Vehicle:

Filter

Compression Ratio

10.5:1 8.8:1 9.25:1 9.3:1

Size Over Standard

0.005 in. Larger than Stock 0.010 in. Larger than Stock 0.020 in. Larger than Stock 0.030 in. Larger than Stock Stock

Prices

$100 – $250 $250 – $500

Please enable JavaScript so that Parts Giant can function properly (privacy policy)