PeterF

Have you tried the recommended fuel which is 10% nitro and 15% oil, old guidance was oil should have small castor content but now full synthetics seem to have been approved. I was talking to owber of local model shop few days ago and he said the only problems he sees with customers and RVC engines is when the wrong fuel is used. He said they are fairly critical and the recommended fuel should be stuck to.

Another thought, the cylinder has not been rotated on the crankcase has it to alter relative direction of ports and starter as the timing could be slightly off - bet then would not run when it did light.