Brendan78
Senior Heliman
Location: Cronulla, NSW Australia
My Posts This: Topic Forum | Hi Chuckie,
The carb part numbers are different, and it also has a steel lined backplate and bigger heatsink on the head. I took the engine out to the field yesterday afternoon and I still got the "pulsing" of the tail in idle up. It's starting to do my head in. I've started with the needle settings in the manual and also worked both high and low out as per the tunning guide you have posted but I can't seem to figure it out.
I've got curve's setup in ST1 and Gov in ST2 running a magnet in the fan (SR3C can't use the backplate sensor). It will sit there fine in idle up until I do a few pitch pumps and then it will slowly move into an oscillation (tail will pulse as you can hear the Rpm change slightly). On curves you can hear it intermittantly, but the gov turns into into a clear pattern (obvioulsy it's trying to control the rpm).
This generally points to a fuel problem/pressure problem. I've started at the manual's factory settings and worked my way richer and can't get rid of it. I replaced the fuel tank, by-passed the header, and now replaced all the fuel lines. I've also tried and Enya 3 and OS8. I'm running cool power 30% heli. I'm pretty stumped as to what it is. Engine doesn't come down hot and is fine during the hover and idle (transitions fine, no cackle when I hold it on the hover to idle up either). I've read where the engine will oscillate on gov if not tunned right, you can hear it on curves as well however (not as clear a pattern as on gov though). I am also going to replace the check valve just in case, but haven't done this yet.
The Kasama header is not only flowed better, but apparently shorter as well so would be slightly different that the flowed hatori header. Any ideas? I've run your needle settings (Actually made the engine sound a bit lean, might be the Kasama header), and it needed to be be a bit richer. |
