Upon installing a set of Dynatek DC1 coils on my XJ550, not only does the bike fire up with minimal choke but it seems to achieve idle at 1100 rpm without choke in under a minute. It was a little fussy warming up with the other coils which were stock CB750 coils. Under acceleration the response is very crisp and it immediately drops back to idle with no occasional hunting to find its idle rate. Visually, the spark is noticeabley larger with a snap healhy snap sound when it ignites. If you have been wondering about these coils and if they are worth double the price of similar stock replacement 3 ohm coils, bottom line is: get some!