Bob, sorry if I offend you but maybe my leak of English makes you could misunderstand me when said "reinvent the wheel" it was just an expression. About the spark plug, go with NGK MC6, and recommended gap. For oil, may ask you were did you get your engine? the should give you some information. Boby at Cactus gave me plenty information at first time and he said to use Honda HP2 oil in a ratio 50:1 . You can also use the ZENOAH oil which is a good one too. For break in you can use a lower ratio like 48:1, I`ll on mine and see how much fouling after first tank. Also I have a bunch of Klotz blend which I use on my racing boat engine and this also should perform well. Very important Bob is the type of fuel you are going to use. Remember as higher the octanes it burns slower. High octane is more suitable for high compression engines and with timing advance sistems. Our engine falls in this category. If you use lower octane, you could have preignition problems and also het problems. Use premium unleaded. Dont store you prepared mix too long, try to use mix not olders than a month.For this reason I`ll suggest to have a graduated cup so you can prepare the mix in small amounts and if very few remains, will not be a problem. :thumbup: