Fitments
70-99 Big Twin (Excl. TC); 71-03 XL Sportster (NU). With mechanical advanced ignition
Part Description
Breaker weight spring set. Standard
With standard springs for stock advance curve, best for most OEM applications. OEM replacement reference 32605-70 (standard strength springs). Note: Using stronger than stock springs will give a slower advance curve and can be used to solve detonation (pinging) issues in high compression engines or poor fuel. Note: 516300 is standard replacement, 516301 is heavy duty, 516598 is extreme duty. Mixing different spring strengths will give additional fine-tuning options. Note: Stronger than stock springs may require carburetor adjustment.
