Look on the side of the carb. they are there. You will probably need to remove the air cleaner form the carb to see them and then you may need a special tool to adjust them due to the EPA covers on the screws. Hope this helps.
? 2:50www.youtube.com/watch?v=uFN82KDj3a8Nov 1, 2013 - Uploaded by mountainbikekayak
So this is Part I of showing it want start but adding prime it wants to. Part II will show replacing the fuel filter did not fix it and then replacing the ...
I know this is a very old post, but figured I'd answer it so any others with this issue can have the fix.
With Echo trimmers not revving to speed although they start with no problem, the issue is usually the muffler screen. It becomes plugged with carbon because of improperly mixed 2 stroke fuel.
Remove the screen from the muffler and burn off the carbon with a propane torch, or wire brush it off. Once cleaned engine should rev to speed.
Classic sign of coil failure. Run it until it cuts off then test the coil. Most likely 0 resistance, complete open circuit. This is common, coil can't be repaired, only replaced. It is a simple fix, and echo trimmers I believe are worth the cost of coil to repair. Plenty of youtube videos on how to do this repair.
This appears to be a good news problem. There is an easy fix/work around! Consumer reports found the same problem that you have discovered.
Holding down the check battery switch allows the unit to operate. Read the link around the sixth paragraph the story is told.
Echo Trimmer Can Be Tricky to Start
"Our testers discovered the fix by chance. Pressing the check battery button, a last-ditch attempt to get the trimmer working, made all the difference. While this button ordinarily indicates the battery's charge status, in this case it also served to keep the battery from switching into protection mode and cutting off power to the motor. The next time you fully charge the battery, however, the problem can reoccur."
Hope this has helped?
Air fuel and gas... It needs all of these
Are the crankshaft seals any good ??? This causes an air leak, leading to the engine not being able to draw in the air/fuel mixture
Check this by spraying carb cleaner into carb. Does it start ???
Did you check for spark ???
Did you set the coil gap ??? .010
Did you check compression ??? Someone mentioned 100psi. Close but most wont run under 90psi. Others need 120psi. Echo's will run under 90psi but not much lower
Did you remove the muffler and check the exhaust side of the piston ??? Scoring will keep it from running but I have seen them run, albeit poorly but still run with major scoring.
Is the spark arrestor still installed ??? Is it plugged ???
Just some of the tests I perform since I am an Echo/Shindaiwa Tech