* Maintenance: Regular and proper maintenance is crucial. Neglecting oil changes, filter replacements, and other scheduled maintenance will drastically shorten the engine's life.
* Riding Style: Aggressive riding, frequent high-rpm use, and hard launches put more stress on the engine than gentler riding.
* Storage: How the motorcycle is stored (indoors vs. outdoors, covered vs. uncovered) affects the engine's longevity.
* Engine Model: Different Buell engine models (e.g., the various versions of the Harley-Davidson-based V-twins) might have slightly different inherent lifespans.
* Previous Owner's Care: A well-maintained Buell could easily exceed 100,000 miles, but one neglected could fail much sooner.
While some Buell owners report exceeding 100,000 miles, others have experienced issues much sooner. Therefore, it's impossible to give a definitive mileage figure. A well-maintained Buell engine *could* potentially reach very high mileage, but it's not guaranteed.