Hi - I called Gerrard when he was selling the Moki 1.80, and he told me to use the K&B1L plug. Have been using it for years and it works great. When you get a good choke, you will hear the sucking noise, and then you know it is ready to start. Put your battery on the plug and give it a backward flip, and mine starts first time every time. When Horizon was selling the Moki engine, I talked to Mike McConville, and he said he uses Omega 15%. He said the engine need a little castor. I have been using this for years on my 1.8 and 2.10. They run strong and have never had a problem with them.