It consists of drilling the accelerator pump nozzle orifice to a larger size, drilling and tapping the float bowl to accept a leak jet for the accelerator pump, changing to a Honda HRC needle (that is no longer available through Honda), and putting an o-ring around the accelerator pump linkage. It mostly focuses around improving throttle response and eliminating a bog some people experience when stabbing the throttle. I don't see it affecting the starting ability of the machine.
Other things I would look at:
Making sure the carb is clean. Especially the pilot circuit and fuel screw passages.
Correct jetting/fuel screw setting.
Correct throttle cable free play. If it is a little too tight the throttle safety switch won't let it start unless you open the throttle slightly.
Fresh fuel and a new spark plug. I've had old plugs cause hard starting issues before but run fine otherwise.
Inspect the intake boot between the head and the carb for cracks. Often you have to remove the boot and look from the inside to see them.
Inspect the auto-decompression device on the cam and make sure it's working properly and there is no worn spot on the finger follower that it presses on.