well the engine I have will turn on if its at full throttle but if, while its running I try to make it idle it shuts off within seconds. I am not sure what is causing this problem but any help would be appreciated.
I had this problem. Clean the low speed jet. While ur there do a whole carb clean. I dissassemble the whole carb, wash in a tin of fuel and then blow out with air compressor. Heres how to take it apart: http://outdoorpowerinfo.com/repairs/honda_gx390_qa2x_carb.asp