Barry,
Try closing off the high speed needle all the way and see what peak rpm you get. When my engine came thru with a plugged high speed jet it would run great up to 4000 rpm sag and quit. With a different carb it might be able to run as fast as yours.
If you get the same peak rpm you will know for a fact it is the carb, otherwise it would lean to toward the ignition.
Brian
ORIGINAL: Barry Cazier
Just started my new DLE55 for the first time today. It started very easy and settled down to a nice smooth idle at about 1800 RPM. I let it idle there for several minutes then started reving it up a bit. Everthing is fine until I hit almost exactly 5100 RPM and then it will just quit. I did this 20 or so times and it quits every time. I tried opening the main jet from 1-3/4 to 2-1/2 turns open and it didn't change a thing except at 2-1/2 turns the bottom end a bit crappy. I also turned it in to 1-1/4 turns with no difference.
I'm using a 4.8v NiMH battery that is new and freshly charged. After I did the run I tested the voltage at 5.4volts.
Started very easy every time but will not accelerate past 5100 RPM. The only think I've done that isn't stock is but a nipple on the carb plate and route a tube outside the fuse. I've have other gas engines that will richen right after take off if you don't have this tube. I've been putting it on all my engines for some time and did it on the DL. I can't see why that would make a difference...but maybe. Also changed the stock spark plug from ''no name'' to CM-6. Those are the only changes I've made.
I'm running a rear exit canister muffler if that is of any concern.
Any ideas would be greatly appreciated.
Thanks
Barry