Coronabob,
Use this as an example. If you buy a car designed to run on premium, and instead run it on cheap 87 octane and experience problems with it running. What is the first thing the dealer is going to tell you.
Sure it sounds like you might have a regulater issue, and yes you can probaly get it to run, but it will never idle, transition or have run like it was intended to. Plus the needles are going to alot more sensitive, and you are probaly not running 20% oil either are you? That is what the YS is designed to run on.
It is kinda like buying a Ferrari and trying to run it on 87 octane.



FUEL RECOMMENDATION:

YS 20/20. This fuel is made by several different fuel manufacturers. All are suitable. 30% heli fuel also works well for those desiring more power.


GLOW PLUG:

YS #4 or OS Type F.


PROP SIZE RECOMMENDATIONS:

YS 63 -- 11 x 7, 11 x 8, 12 x 6, 12 x 7, 13 x 5, 14 x 4.
YS 91/110 -- 13 x 12, 14 x 10, 14 x 12, 15 x 8, 16 x 6.
YS 140 Sport - 15 x 13, 16 x 12, 17 x 8, 17 x 10.
YS 140DZ -- 16 x 14, 17 x 12, 18 x 8.

Other prop sizes may be used as long as the engines run in the recommended RPM ranges. In hot weather and break-in of new engines, use the smaller prop sizes to lessen the load on the engine to help it run cooler.


RECOMMENDED RPM RANGES:

YS 63 -- 10,500 to 11,500
YS 91/110 -- 8,800 to 9,800
YS 140 Sport -- 8,000 to 9,000
YS 140DZ -- 8,000 to 8,500