G'day

Another vote for lots of castor in the fuel. I have had a couple of LA 46 engines. They are perfectly happy with 10% nitro (and probably with 5%) and they do like Castor oil. All castor would be best but a high percentage is better than none. I would not run it on straight synthetic oil fuel though.

Also, keep your fuel clean and don't get dust into the engine. The lining on the ABN engines like your LA is not as tough as the older (and better) ABC engines and a dusty environment or dirt in your fuel will quickly kill the piston and liner. Lean runs won't help either so always tune it slightly rich and you will have a long lasting engine. I recently replaced the liner on an LA 46. It was worn right through the Nickel plating and a friend described it as looking like it has been fed "a high silica diet". Despite all this, it would still run fairly well but for how long?