Those old 35s were/are great engines..The mag coil from a G38 bolts right on and replaces the coil and points on the older ones...I still have a big box of Q35 stuff here...I got into 1/4 scale sometime in the early 60s, must have been right after Klaus took over....My neighbor has a chainsaw he bought 30 or more years ago with what must have been the predecessor to the Q35 airplane engine in it...It's identical with the exception of the spark plug location...The plug is on the front side of the cylinder and so the plug wire is only about 3 inches long...One one of the rollers somehow got out of the rod...took it apart and put in a rod and rollers from one of the other old Q35s here, now works fine again...