Radio Control - DLE 20cc gas engine problems

  • I'm using a DLE 20 in my top flite P-51 and ive encountered a recent problem with the engine. We have still been messing around with the tuning needles, and mind you we did not break the engine in before it's first flight. Anyway on to the problem. The engine has a problem where it won't idle after a full flight on landing. It will idle before the flight, but while on final approach to land, i pull the throttle stick back to idle and the engine hangs at about 25% power and won't reduce to idle(if the engine does end up idling on landing, as soon as i add power to taxi back to the pits it will hang at 25% and not go back down) . Now another problem in correlation with this is that the engine will rev like, enough gas, not enough gas, etc. the throttle pushrod is not moving when this happens. We can't determine what it is. Here is what we have done as an attempt to fix it. 1. unplug ignition and clean connectors. 2. clean out the spark plug for any carbon build up (we found none). 3. check to make sure the ignition is making good contact with the plug. Now we did discover that the plug is only touching the plug on a small surface (we saw a mark where contact has been made) and this was on the edge of the plug. To tighten it up we put a hose clamp around it, but we don't know if it fixed it. It could be the carburetor, the electronic ignition, or several other things. Any suggestions to fix the issue are greatly appreciated. And i know this sounds confusing, but its the best way to explain it.
    Source: rcgroups.com
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