Hi John, I usually start them on full throttle then back it off but I find they will usually start pretty much anywhere, but full throttle is the spot I prefer as it makes sure there is fuel going straight in. I usually give 2/3 primes. You don't have to do the idle screw, just means that if you pull the throttle back fully the motor will usually stop because it will idle down too low. The idle screw just means you can just crack open the poppet to allow it to idle. This can be played with by only fitting 2 washers under the cam, but this usually keeps the revs too high for my liking, when you are emptying the catcher etc. You can use the existing kill switch but I found them too problematic and this is probably because all the aftermarket kill switch rubbers are not fit for purpose, I was spending way too much time trying to get them to work only to have them play up. The most annoying thing with the whole setup is the lump on the cam that once the lifter goes over the top into the stop position it often becomes impossible for the throttle cable to fight the spring tension and get the lifter to rise back up over the hump. Cutting the hump off gets rid of this problem but then you need to put the washers under the cam to lift it up to the same height as to what was the top of the hump. If Victa had just kept the hump height all the way, none of this would be a problem and the kill switch setup would have probably worked fine. The big problem is the cable has to fight going back up over the hump, fighting the spring and break away from the kill switch rubber which can often jamb all at once.