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Use a flexible feeler gauge to measure the gap. The magneto gap for any 2-cycle engine chain saw should 12-18 thousands of an inch. The gap is much less important than simply NOT HITTING the coil frame at any point on the flywheel. The nut is probably metric but I cannot tell you what size it should be. BE CAREFUL! Some chain saws have LEFT HANDED THREADS on such shafts! But you can usually tell by studying the protruding threads at the nut … if there are any!

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As long as it is not less than 0.30mm, it will be OK. If the gap is too great, the engine may not start as easily. If the gap is too small (< 0.30mm), there is the risk that the coil and flywheel might touch as the flywheel heats up and expands when the engine is run.
Setting Gauge 0.35mm for Setting Ignition Coil Gap. Genuine Stihl Part.
What is the correct spark plug gap for my STIHL trimmer, chainsaw, or blower? The correct gap setting is 0.020″.
The correct gap for a Stihl BG55 is . 02 inch or . 5 mm. To set the gap, slip a spark plug gauge between the electrodes at the tip of the plug.
If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency.
Pitch is the correct term for the space or gap between the coils and active coils of a spring. It is what gives a compression spring its force. That space is what permits a compression motion in the spring to take place.
The Stihl chainsaw scale

Each model number contains three sections: MS, MSA, or MSE + numbers + letters. Let`s start with MS, a straightforward one to explain. MS stands for Motors├Ąge (chainsaw in German), and MSA means it is a battery chainsaw, while MSE indicates it is an electric chainsaw.

The distance between the tip of the spark plug and the central electrode is called the “spark plug gap” and is a key factor in the function of a spark plug. Spark plug gaps for car engines are typically 0.6 to 1.8 mm (0.024 to 0.071 in).
The flywheel works with the standard OEM clone coil with a recommended coil gap of . 038-. 040″.
Plumbing codes require a minimum air gap spacing or air gap opening of 1 inch (or 25.4 mm), measured vertically.
Pro Tip: Most plumbing codes require a minimum 2″ air gap. For discharge/supply pipes that are larger than 1″ in diameter, the minimum gap distance is usually twice the pipe`s diameter (e.g. a 2″ pipe requires a 4″ air gap).
A proper spark plug gap is crucial to an ignition system and the health of an ignition coil. A worn or excessive gap will cause an ignition coil to work overtime, using more voltage to bridge the gap and create a spark inside the cylinder.
For small PM synchronous motors, the air gap (mechanical clearance) between the stator core and rotor poles or pole shoes should be 0.3 to 1.0 mm [6,8], and can even reach 1.5 mm [9]. The smaller the air gap, the lower the starting current drawn by the motor.
(1 + a). If a constant magnetic field B. exists perpendicular to the coil, then find emf induced in coil as a function of time.
The flywheel works with the standard OEM clone coil with a recommended coil gap of . 038-. 040″.
A proper spark plug gap is crucial to an ignition system and the health of an ignition coil. A worn or excessive gap will cause an ignition coil to work overtime, using more voltage to bridge the gap and create a spark inside the cylinder.
The gap setting is different for each vehicle but most are somewhere between 0.028″ and . 060″. Consult the owner`s manual or Champion ┬« catalog to find the recommended setting for the vehicle you`re working on.

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How to replace ignition coil on asthil 029
ANSWER : Coil should be held on the saw with 2 torx t27 size screws. These will resemble a star. Remove the 2 screws, lift out the coil. The small wire should be attached with a spade connector, slide the spade off with needle nose pliers. Disconnect the spark plug wire from the spark plug, & thread it out of the saw as you remove the coil. Assembly is reverse order of removal. For clearance, loosen coil screws, alike coil away from flywheel

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I have a Poulan chain saw (PN 4620) can you tell me the size of the file to sharpen the chain. Thanks
ANSWER : 3/8 low profile chain requires a 7/32 file

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Chain keeps falling off – Poulan 18" Chain Saw Replbar (small Saws)
ANSWER : Your chain is too loose. If you’re using an old chain, you might need to have a link taken out of it. You can find replacement chains for your saw at Hyperparts.com. Use the application lookup link at the top of the page with your model # to make sure you order the right chain.

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Coil gap What is the coil to rotor gap for a Poulan Pro 285
ANSWER : Remove the plug. Place a business or index card between the coil and flywheel. Rotate the flywheel until the magnet holds the coil tightly against the card, tighten all fasteners. Rotate the flywheel until the magnetic attraction eases and remove the card. Rotate the flywheel through a couple of revolutions and ensure nothing drags or contacts the flywheel. HTH
Lou

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I was using the saw as a chain saw last weekend to cut up an old tree stump when the chain came off. I don’t know how to access it to put it back on and don’t have a user manual. The saw belonged to my late father and I don’t know if he even kept the manual.
ANSWER : You will have to remove the cover on the side the chain bar goes into. There should be one or two nuts holding the cover on the side. The is also a chain tension adjuster you may have to loosen to put it back on. Make note of the direction of the teeth on the chain. It is an directional chain. The tension adjuster is usually a flat head screw on the front side right beside the chain bar.Unless it is a really old saw, manuals are available from most manufacturers for free download. See if you can locate a brand name and model number.

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Need to know the size to use to gap the coil and flywheel
ANSWER : The gap will vary, depending on engine wear.If you have a ‘ feeler gauge’, it won’t take you long before it runs beautifully.That’s it, oh and, don’t forget to rate:)

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What causes the chain on my 240E to jump off the chain bar often, the chain tenson is correct.
ANSWER : Is the bar bent?try and flip it over and see if it falls off the other side if you can see a bend

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What is the coil gap setting for a 1998 Husqvarna 141
ANSWER : The coil gap shpuld be 0.3mm

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