Originally Posted by
drube
I'm having a hard time getting my DLE 30 to stay at low idle. I have 2 gal through it so far and changed the plug to a NGK, running a 18x8, am hoping it's just a break in issue. When I blip the throttle it will drop down to low idle but soon after return to a high idle. I don't have a tach yet so I can't tell you the rpm's. Other than that the engine runs great!
Any idea's?
Thanks
that sounds like the low end is too LEAN... and perhaps the high end is too rich.
(think of the explanation below as a cartoon diagram... not 'technically correct' but should get the point across)
when above idle, (the high end needle is 'in charge' and is set slightly rich) you go to idle.
the engine idles down, (now the low end needle is 'in charge') since the engine has a slight amount of 'extra' fuel (from the slightly rich high end needle) it initially idles low
then burns off that 'extra' fuel and settles into a slightly lean (and slightly high) idle.
I had a very similar issue with my DLE30 (also using the NGK plug)
the other issue I had with mine was that the throttle servo itself was not fully closing the throttle valve.
after adjusting the servo and linkage to the point where I could kill the engine with the throttle trim, AND tweaking the needle valves, all my high idle issues went away.