I have just converted a Moki 1.80 glow to gas using electronic ignition. I have added an extra head gasket to reduce the compression and have adjusted the timing to get the engine to run smoothly. I found the Moki methanol carb to be a bit touchy on the needle so I now use a walbro. Engine is running on 97 octane petrol with 20% TCW outboard high quality two stroke oil added. Tickover is very good but at full throttle the engine will only peak when it is hot and the aircraft in a slight dive otherwise it tends to 'burble'. The engine at full throttle therefore would appear rich but if I close the high speed needle it will cut especially as it comes up to top revs on fast throttle up. Is this because the high oil ratio is reducing the octane ( power ) of the fuel mixture? If so is 20% being too cautious?