It would be much better/cheaper if you got it running right before putting a pump or regulator on it. I would like to know how far the tank is from the engine and are you using a pitts muffler? If you are convinced that the lines are big enough and that it's not a muffler pressure problem, you could put a Cline regulator on it. But if you have other problems like debris in your engine, the Cline will not solve anything. Some people use Perry pumps but there are more problems reported with the Perry if you do a search on it. The Cline has very few problems if installed correctly. There's no adjustments. I have a Moki 1.80 with the Perry VP30 and a Moki 2.10 with the Cline. The Cline works way better.

Another really good plug that is recommended by the Moki importer in the US is the K&B 1L glow plug. It's not usually in hobby stores but it can be ordered. They are under $3 US each. They work great, it's all I use on my Moki's.