Question about Echo CS400 18" Chain Saw

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My saw won't start. how can i check the ignition?

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Pull the kill wire off at the ignition coil - retest for spark , if now spark faultry kill wire or switch indicated
but if no spark fit spark tester in line with h t lead and spark plug

gap tester is basically a piece of wood with 20 mm hole in middle and a hole drilled through to centre from opposing sides
the a nail that fits firmly is pushed through 1 on each side
and meet in the middle of the hole , but the points of ecah nail must align together and be exactly no less than 6.00 mm apart from each other ( place the tester inline between h t lead and plug ) use whater adaption you may need to connect to the saw
and pull the engine over as you would

if all is well the spark should jump across this gap and the gap at the plug while under compression pressure

you will see it in the the tster window

if no spark coil is problem
replace coil and set air gap to 0.010" and refit wires ands covers

cheers hope it helps

pauly46

Posted on Oct 02, 2010

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Start at 1.5 CCW form lightly seated then tune for performance like this:
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.

I think your starting procedure may be the cause of flooding. Flooded is the #1 cause of hard starts in 2-cycle engines. Read carefully the recommended start in your manual. most miss the second note. It should be similar to this (read 3, read it again):
Warm start in the manual says 1/2 choke BS. Close choke, (sets fast idle) open choke, pull rope.
Start Procedure
Cold:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4).
  4. Set compression release – optional step even if saw is equipped with a compression release.
  5. Push (open) choke pull starter until it starts (usually first pull).
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) – Do not pull with choke closed.
  4. Push (open) choke, pull starter until it starts (usually first pull).
If you still have trouble reply as you did before. I will get back to you. HTH
Lou

Feb 18, 2010 | Poulan Garden

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