ORIGINAL: crhammond
Dick - I am with you on oil. I recently went from 100:1 to 32:1 in my gassers and they wear longer, make WAY more power and run cooler. I am converted.
My reason fro the low oil parts is not to use low oil (well maybe a tiny bit less like 15%) but because from Chad's description it sounds like they have made a spiral channel that gets more oils to the cam gears. In a YS (or any 4-stroke) that can only be a good thing
OS has the best take on this part of the 4 stroker - the old Saitos were horrible the spur cut gears on the cams would easily end up dry and squeaking. YS was darn good too I modified OS supercharged (a real turkey) OS91 (a gem) and YS to get max power and they oiled well as long as you ran a good mix 20-1 and set th needles right etc.. but adding ignition nd still running alky and oil is a great setup
Today ther are ignitions which are very inexpensive and work well . a few years back any decent conversion was well over 100bucks.
I have gone to A123 batts and electrics for my aerobatic stuff
screw the FAI rules those were made to control the products used .