Not necessarily. The aim of the BK mod is to rid the engine of that annoying hesitation when the throttle is whacked open quickly. It appears that each machine responds differently to this mod. The BK mod, in a nutshell, shortens the duration of the fuel squirt delivered by the acceleration pump. To tune this fuel delivery
, begin by adjusting the initial timing so that it just clears the bottom of the slide. It should not hit the slide. Then, it should only squirt for about .3 seconds. Yep, it's just a quick squirt. With an acclerator pump type of carb, this design is meant to deliver fuel quickly that would otherwise be dependent upon intake vacuum as in a CV(Constant Velocity) type of carb.