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Need to know spacing requirments for magneto on mcculloch model # 600016h. is it possible to test coil and how would you do so?

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Spacing is probably .010. You can test it by getting a flashlight battery and light. Connect the base of the light to the spark plug cable. Connect the ground wire of the coil to the bottom of the battery, and hold the other end of the battery on the light. If the light lights, the coil is good. If not, the coil is bad.

Do not use anything over a 1.5 volt flashlight bulb and battery. The bulb does not have to glow, just light, to prove the coil.

Posted on Jan 23, 2009

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The gap needs to be as narrow as possible without any actual rubbing of the rotor against the magneto. The spacing is not as critical as with spark plugs or points (remember them?) since unlike those gaps there is no spark jumping across this gap.

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I have replaced magnetos and they are simple to install, and almost impossible to mess up if you do it this way. All you need is a piece of thin cardboard (not corrugated). I use a glossy business card without raised lettering (so it slides easily), or the like.

1) Rotate the flywheel so that the magnets are NOT positioned in front of the magneto, then loosen both screws of the magneto so it can move freely.

2) Insert the business card between the magneto and the flywheel such that the glossy side of the business card faces the rotor.

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4) Then while pinching the magneto and ends of the business card tight between your fingers, rotate the flywheel to position the magnets directly in line with the two sides of the magneto.

Note: The magnets will grab the magneto and try to move it. As long as the slippery side of the business card is facing the rotor and you haven't removed the screws, it should move fairly easily.

Since the magnets want to pull tight to the magneto, but the business card thickness is the same across the entire surface, this gives you an even spacing between both sides of the magneto and the rotor. Essentially, the magnets on the rotor do all the work for you. with regard to alignment. As long as the magnets (flat shiny polished square surfaces on the outer rim of the rotor) align directly with the two faces of the magneto, the alignment is automatic.

5) Once you have the magneto and rotor in perfect alignment, cinch down both screws in an alternating method, first just to where they start to grab, and then back and forth a few times until they are firmly tightened.

6) Now, unfold the flaps of the business card and let it move with the rotor instead. You should be able to rotate the rotor away from the magneto and the business card should slip out easily. It may stay where it was or it may slide out from the magneto - either way will work.

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Ignition Coil Test
SmallEng.com
http://www.youtube.com/watch?v=L7WNBDRG4C4
You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You don’t have to bend up the electrode.

If you really sure there is no spark turn on the ignition, put your pinky finger in place of the plug, and give a short pull. If you didn't get shocked the coil, switch, or wiring is bad.

You can find an IPL for your saw here:
McCulloch International
http://www.mcculloch.biz/
The model you provided does not cross. A number on your saw will match something. Your coil part number can be found there. HTH
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