Well the engines do take a little time to get broken in but after a couple gallons you should be good to go. What happens when the engine is new and breaking in its making lots of heat...so the mixture needs to be rich to help this problem. As the engine break in a little the heat generated is less and you have to lean the mixture to keep the heat at the right levels.


Remember these engines work very similar to diesel engines. They work on temperature and pressure. They is not a spark plug that makes the fire. So mixture settings are very Dependant on heat generated. If the engine is running too cold or running too hot it will not work on the right mixture settings. Since during a new engine seating and break in period the engine is going from a hot running friction grinding beast to something that is smoothed out and clearanced properly the heat generated is different.


For the most part regulator changes are rare....but on a new engine they will almost always need to be done. The regulator adjustment is not something that will change much but a 1/2 turn to a turn each way is not uncommon between all the engines. This has to due with spring tensions....and machining and all the other things like fuel choices.

You are in Tuscon, AZ so your elevation is higher than most places. Usually this would mean a slightly leaner setting. Local conditions, temps, fuel, load, all these things play a role in the mixture settings. There is no way in Japan at Sea level and 70degs F a setting for 20% Cosmo fuel is going to be the exact fine tuned same setting as Denver Colorado at 6000ft and 30% heli fuel and a 90deg day. It just ain't so.

This being the case its really rare to have to touch the regulator changing elevations. I have however when I lived in Denver had to change it but its really rare

Since the engine is new its likely close and your setting and symptoms show its close....but a little fine tuning is not a bad thing.


Troy Newman
Team YS