I have the ZDZ 80 single which only has about 4 gallons through it and I'm having problems with it staying at a high idle. On my transmitter I have set up a high and low idle switch. The motor will run for about 30 seconds on high idle and then it will act like I had switched it to low idle. I have gone as far as to putting a Walbro carb to see if this is the problem but still no success. I had three deadsticks today and each time I had a very high idle on the ground. Other than this problem the motor pulls my 26lb sukhoi with no problems at all. I have tweaked with the low end needle setting and got the motor to run awsome for a minute or so on the ground but as soon as I get airborne and get some altitude the idle drops way down. HELP!!!!!!!! I have no ideal to whats going on. Any help would be appreciated.