I know it's 25-29% castor for old fox 35's and 22-23% castor/synth blend for newer ABC/ABN engines, but what about some of the old OS-S series, SuperTigre 35's, Veco 19-35's or Enya 15-35 ect?
I've been running the Power Master GMA 10/22 in them but not not sure that's the best fuel for them. What say you ?
Hi Clint
It is not all castor for Foz 35s, they work even better on part synthetic, I still have mine from the 1970s and they still are in great shape after 100s of runs, and they are not black from burnt castor goo.
I used 28& oil, with 1/4 synthetic in mine, it lubricates better, and keeps the engine cleaner, provides longer life and feels like they have better power over the life
Do NOT be confused by people telling you that The FOX 35 was designed for castor only... The synthetics we have did not exist back then.
The ONLY engine i would still use all castor in, is one that has burned on castor coating all over the side of the piston.
As far as your OLD OS 30 35 S engine use the exact same as the FOX
For the ST 35 they work well in a 1/2 syth blend at 24 to 25 %, the ENYA engines will work well with that mix too, although many run 20 to 22 % oil
For others that do not have bushed rods, the FOX blend work well
You may want to read my engine article posted pinnned to the top of this forum
Randy