Do you own any Clinton 2 cycles?
Among the vintage karting community, he is considered an expert on Clinton two cycles. He builds several throughout the year for his own use on his vintage karts (and a couple of bikes) as well as for customers.
I can name several vintage karters who recommend 16:1 with Clintons, and slightly higher with PP/WB.
Dave Bonbright, who is well known US 820 builder (and that is a tighter engine than an A400) recommends Blendzall green label castor oil at 24:1.
Should I use the ratio on the side of the engine then? And just use 2 cycle instead of sae 30? And nearest pure gas is about an hour away, I can wait until the weekend and go get it but 92 octane would be fine?
I'll assume you got my PM's on the subject, since I was trying to avoid yet another OldMiniBikes pissing contest. I run Burris synthetic at 16:1 on my A400, and 20:1 on my West Bend.
The gentleman who built the McCulloch which is going on my latest project, a vintage racing kart, has been building those engines since the sixties, and still builds them for customers. That engine is way tighter than your A400, and uses needle bearings. He recommends 16:1 Castor Bean for break in, then 20:1 synthetic for the track.
In your case run the 16:1 synthetic two stroke oil until you get it tuned, then go ahead and run 20:1. Many an experienced kart tuner has leaned one out on race day and stuck the piston. I've never mixed higher than 16:1 for my Clinton bushing engine.
The same McCulloch builder by the way said that they (his whole family of three generations race vintage karts) tried higher octane, non-alcohol fuel and didn't see a difference with it, and some of their engines actually ran worse with it. I haven't dealved into that yet, so just repeating what I heard.
This is my last post on the subject, sorry for ruffled feathers again, and thanks to Terry for chiming in. If you PM Scrambler1, you will find him extremely knowledgeable on the Clinton, as well as honest, with no axe to grind.