what is a good fuel mix for the PA75
whatever fuel you buy or make use 20 % oil with mostly synthetic, I would not use over 1/4 of it being castor . Many make their fuel and use Super Techniplate, which is 25% castor, Use 5% in cooler months, and ... IF... is needed. then go to 7.5% , 10%, Sig is oK but NOT SIG Champion, as it has way too much castor in it, and as Brett said will tater up badly, I have used a lot SIG 4 Stroke fuel, with 2 ounces castor added
Randy