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: Buying Guides
Harley buying guides: years to avoid, model comparisons, and which to buy used.
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 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 Softail Years to Avoid (Every Model Year Breakdown)
Avoid 2000–2006 Twin Cam 88 (cam chain tensioner failures) and 2018–2019 M8 (rear shock recall). Best Softail years: 2020+ Milwaukee-Eight or 2012–2017 Twin Cam 103. Full era-by-era breakdown with NHTSA recall data and service manual specs.
Harley Fat Boy Years to Avoid (and the Best Years to Buy Used)
The 2007 Fat Boy is the one year to avoid — NHTSA fire recall plus first-year EFI and cam tensioner issues. Best buy: 2020–2024 Milwaukee-Eight 114. Full year-by-year breakdown with NHTSA recall numbers and service manual citations.
Harley Road Glide Years to Avoid (and the Best Years to Buy Used)
The Road Glide years to avoid are 2015-2016 (Twin-Cooled overheating) and 2017-2018 (Milwaukee-Eight oil sumping, plus recalls 17V333000 and 18V734000). Best years: 2012-2013 Twin Cam 103 on a budget, 2020+ M8 for peace of mind.
Harley Street Glide Years to Avoid (and the Best Years to Buy)
Which Street Glide years to avoid and which are the best to buy used? Our research maps every model year from 2006 to 2026 – covering four NHTSA clutch recalls on 2014-2016 Twin-Cooled bikes, early M8 oil sumping (2017-2019), and why 2020+ is the reliability sweet spot.