The Milwaukee-8 107, 114, and 117 differ in bore, torque output, cooling, and which models they come in. We compared service manual specs and owner forums to give you a straight answer on which displacement to buy.
Category: Harley Davidson
Harley Softail vs Touring: Which Family Is Right for You (2026)
Softail vs Touring – which Harley family fits your riding style? Our spec-verified comparison covers weight, engine options (M8 107/114/117), fuel range, comfort, and price so you can choose with confidence.
Harley Road Glide ST vs Low Rider ST: Which Sport-Touring Harley to Buy
Harley Road Glide ST vs Low Rider ST: both share the Milwaukee-Eight 117 High Output V-Twin (127 ft-lb), but the Road Glide ST is a full bagger with 6-gallon tank and hard bags for 500-mile days, while the Low Rider ST is a lighter muscle-cruiser with mini-fairing and 4.7-gallon tank. Our research desk breaks down specs, ergonomics, price, and who each bike is really built for.
Harley Street Bob vs Fat Bob: Which Milwaukee-8 Softail to Buy (2026)
Street Bob vs Fat Bob: direct comparison of Milwaukee-Eight Softail specs, tire profiles, ergonomics, weight, and price. Service manual data and owner research to help you choose.
Harley Boom! Box GTS Problems: Glitches, Updates & the Reset That Works
Boom! Box GTS freezing, CarPlay dropouts, black screens, and failed updates — our research into 200+ owner threads found most are software faults fixed by a factory reset or Naviextras USB update. Here’s exactly what breaks and how to fix it.
Harley Sportster S vs Nightster: Which Revolution Max to Buy
Our research compared the Harley Sportster S (Revolution Max 1250T, ~121 HP) vs the Nightster (975T, ~90 HP) across power, ergonomics, tech, and price. Direct verdict: which Revolution Max to buy in 2026.
Harley Charging System Problems: How to Test the Stator, Regulator & Battery
Harley-Davidson charging system not working? Learn how to test your stator AC output, voltage regulator, and battery with a multimeter using real spec values from HD service manuals. Step-by-step guide for Evo, Twin Cam, and Milwaukee-8 engines.
Best Phone Mount for Harley Touring (2026): Vibration-Safe + Wireless Charging
The best phone mounts for Harley Touring in 2026 – from Quad Lock Pro with vibration dampener (iPhone OIS-safe, Apple advisory compliant) to Ciro CyberCharger 15W wireless charging. Covers Road Glide, Street Glide, handlebar vs. perch mounting, and honest pros/cons for each system.
Harley Milwaukee-8 Maintenance Schedule & Service Cost (Every Interval)
The complete Milwaukee-8 maintenance schedule by interval (1K, 5K, 10K, 20K, 30K), with fluid specs from the 2019 HD Service Manual and real dealer vs. DIY cost estimates for every service.