I have not flown the Crackerjack yet. I do not have a Sky F ury; I was origionally going to put on an OK Cub, but it has never been run and I decided to keep it that way-I'm not really a collector,but... What I did put on is a Baby Bee with dual bypass ports and a GloBee head with a timing shim-I do not know the thickness of the shim as my caliper(digital) crapped out (Chineese). I just went trial and error until it ran good- and it DO run good. I am waiting to maiden flight it until my son can be with to help- I am no Spring Chicken and also have not built a stooge yet.Do you think 35' lines are enough for a hot engine? I have been away for awhile and do not remember what I used to use with my PT19 etc. I think those plastic jobs were alot heavier than this built up Plane-I am not sure if I need longer lines or not.( I built my version of the cracker jack with a built up sym. wing and full fuselage) I aim to find out pretty soon!!Thanks for your post-do you have any pics of the Sky Fury that are better than what I posted?[8D]