DLE 20cc unable to idle low enough
DLE 20cc unable to idle low enough or stay running at idle. Help needed desperately. I think I have worded everything done below including back story of engine. I am not sure what might be going on here
Original setup:
1. Separate batteries for ignition and radio
2. Opti-kil switch
3. Tank with fill line, vent line and fuel line
a. Fill line had clunk installed
b. Vent line curved brass tube to top of tank
c. Fuel line had filter installed
4. NGK CM-6
5. Stock ring without reed/carb mods
Crash details:
1. Total radio black out
2. Throttle stuck at about ¼
3. Plane struck ground at angle destroying the fuselage
4. Engine had pulled off firewall
5. Prop was intact
6. No visible dirt in carb
7. One small chunk of cylinder fin was broken off
8. Hall sensor wires on ignition side stripped off
Engine Prep for new plane:
1. Cleaned engine surface all around
2. Repaired stripped wires with new servo connectors
3. Rebuilt carb to be sure no dirt made its way into it
4. Replaced spark plug
5. Reset needles to stock settings
New plane setup:
1. Profile plane
2. Throttle arm in same position as the choke arm
3. Throttle setup with 90% endpoints on both ends
4. Radio/power setup
a. Futaba R7008SB Receiver
b. 2 A123 batteries connected to 2 receiver ports
c. Ibec running from receiver to ignition with 5.3v
First run up:
1. Needles set to stock settings 1 ½ turns out
2. Engine starts up and runs fine from mid-range to high
3. High set to about 8200 rpm
4. Low will not go below 4800 rpm
5. Low needle richened to 4 ½ turns out in 1/8 runs without change
6. reset needles again to stock engine will either drop to 3200 rpm and die or drop then run back up to 4800 rpm
7. needles chased for over 2 hours and looked at by the local gas engine expert
8. Suggested to rebuild carb checking for anything abnormal and checking the inlet needle valve assembly.
Carb rebuild:
1. carb disassembled
2. no visible damage with gaskets, reed, needles/seats, jets or needle valve assembly
3. all gaskets, reed, needles/seats, jets or needle valve assembly replaced with parts from K20-WAT kit
4. while carb removed – reeds inspected – found to be not sealing on either side pulling away from the reed block at tip
5. removed reeds and flipped over
6. reeds now sealing all around
Engine startup:
1. Spark Plug replaced again to rule out
2. Needles set to stock settings 1 ½ turns out
3. Engine starts up and runs fine from mid-range to high
4. High set to about 8200 rpm
5. Low will go down to about 3600 rpm then runs back up to about 4500 rpm
6. Engine runs back up to 4500 rpm then dies out as though it is not getting gas
7. Only way to get the engine to run back up is to re-choke engine every time