Just want anyone who is considering installing a Dyna S... go for it!! For years I've had a starting problem, would never start with elect, always had to kick. Finally spent some $$$ @ Z1 for carb holders, intake boots, carb kits, points, etc. Bike now spins 4-5 revolutions and fires, was happier than a fly on s***. Well after some more $$$, I installed the Dyna S on Sunday morning, static timed it and hit the starter button. Well, got a major suprise when after about 1/2 revolution it fired!!! Went for a quick ride and I think (will go for longer ride this weekend) it pulled harder and cleaner! But it starts so much better. These are my results, yours may vary! Highly recommended!! Z1 has them for $120. Go for it!!!